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Learn Sports Betting

Written lessons and explainers — bet types, desk terms, slang, quizzes, and tools. The full A–Z dictionary is on its own page.

Full A–Z glossary

Sports research guides

Mapping a full NFL survivor pool? The unofficial Circa Survivor 2026 planner covers the Thanksgiving leg and the Christmas leg, and the NFL survivor pool planner covers standard 18-week pools. Both are free to try, and an account saves the build.

NFL survivor weekly picks: Week 8, Week 9, and Week 10. Circa Survivor weekly picks: Week 8, Week 9, and Week 10.

Cold Line Terms:
Video lessons

The Cold Line curriculum

Start here: read the board with confidence

A four-step path from the first line you see to a disciplined way of judging price, value, and risk.

Browse the full glossary
  1. 01

    Learn the three core markets

    Start with the moneyline, point spread, and totals. These are the building blocks for reading almost every sportsbook board.

    MoneylinePoint spreadTotals
    Next: try the payout calculator
  2. 02

    Read the price, not just the pick

    American odds translate a price into an implied probability. Learn how vig changes the number before deciding whether a market is fairly priced.

    American oddsImplied probabilityVig / juice
    Next: try the implied probability calculator
  3. 03

    Understand value over time

    A good process is bigger than one result. Expected value and closing-line value help you evaluate the price you took across a real sample of bets.

    Expected value (EV)CLVClosing line
    Next: try the expected value calculator
  4. 04

    Protect the bankroll

    Use a consistent unit so your results stay measurable and your risk stays deliberate. The goal is a repeatable decision process, not a one-night sweat.

    BankrollUnit
    Next: try the payout calculator

Visual learner? Watch the under-one-minute lessons. Looking up one word? Use the full A–Z.

Full A–Z glossaryBrowse video lessons
Category:Industry language only. Desk words live under Cold Line Terms.

When you have a bet riding on a game, you have action on it.

Every game and every price is built so the house keeps a small slice over time. You can absolutely win tonight — the edge is about what happens across thousands of bets, and it never takes a night off.

How much money was bet in total — not the same as the book's profit.

The team the book thinks wins. You usually pay more than even money to back them.

After the game, the book marks your ticket and pays, refunds, or takes the stake.

Someone has to hang the opener. That is the oddsmaker — also called a linemaker.

The bet is wiped. You get your money back, as if you never had a ticket.

Free-play money. You can bet it, but a winner typically pays the winnings, not the credit plus the winnings.

The number on the left of the team name. Tell the book that number so they grab the right side.

If it loses, the book hands you credit to bet again. You still lost the first ticket.

The sportsbook's fee for taking your bet. That's how they make money!

What percent chance the price says this side has. −110 ≈ 52.4%; +150 ≈ 40%.

−150 means risk $150 to win $100. +130 means risk $100 to win $130.

The sportsbook's built-in margin or the share of wagers it ultimately retains, depending on context.

If both sides of a bet add up to more than 100% chance, that extra is overround — the book's cushion.

What the odds might look like if the book took no cut — a fair coin-flip split of the market's prices.

The favorite gives points; the underdog gets a head start.

A spread with no ties allowed. Half lines can never land exactly, whole lines refund a push, and quarter lines quietly split your bet in two so you can win half or lose half.

In football, games often end with a 3 or 7 point difference (field goals and touchdowns).

The last odds before kickoff. Sharps try to beat this line.

Low-juice moneylines. -150/+140 is a dime line (only 10 cents apart).

The book juiced the plus-side of a price to get you to click it. Read the limit.

You must risk more than you win. -150 is odds-on; +100 is even.

2.50 means a $100 bet returns $250 if it wins — $150 profit plus your $100 back.

5/2 means you win $5 profit for every $2 staked, plus your stake back.

When you bet on the team that's expected to win and must win by more than the spread.

Betting on the team getting the head start.

The dream! Bet one side at one number, bet the other side when the line moves, and win BOTH.

Bet both sides of a two-way ticket so you cash either way. That is the whole point of a hedge: you lock in a win no matter who wins, instead of riding one ticket all the way.

The book will sell you a different hook. Move the number, the price moves with it.

When the half ends, your ticket is done — the third quarter cannot save it.

Who wins. The margin does not matter.

How many games the team wins this year, not how many points they score tonight.

The bet is tied to the name on the ticket, not just the team.

Add up every goal (or run) on the card. One number for the night.

One name, the whole event. They have to finish first, not just win tonight.

You pay for two bets. The place half can cash even if you do not win.

You take the number now, weeks out, and you live with those early-price rules.

Same idea as a parlay. In the UK they call it an accumulator, or an acca.

If one hit makes the next hit more likely, the book may limit or reject the combo.

Not the game. The next snap, the next pitch, then it is graded.

You sell a piece, not the whole bet.

The team that's not expected to win. "I like the dog here."

Betting the other side. The old desk line still teaches it: "Nobody ever lost a nickel betting against the intelligence of the American public" — not a license to auto-fade, but a reminder that the crowd is often late, loud, and overpriced.

When someone's super confident. "This is a lock!" Still can lose though.

In gambling, buried means you're so deep in the hole that getting even isn't realistic. And when you're getting buried, there's only one way to go if you keep playing — and it's not upward. Any gambling counts: tables, cards, horses, or a betting slate.

What casual fans are betting — favorites, overs, stars. The fade proverb about the American public is aimed at this pile of tickets, not a free pass to bet every dog.

70% on Team A but the line moves toward Team B? Sharp money on B!

A name nobody expects to win, hanging at a huge plus number. A team at +1200 wins $1,200 on $100 if it pulls it off.

Finding two books with different odds where you can bet both sides and always win. Rare!

If you bet Chiefs −6 and it closes −7, you beat the closer by a point. That is CLV.

Math that estimates whether a price is good or bad long-term — not a promise that today's bet wins.

Like price comparing before buying. Different books have different odds!

Someone who tries to predict when betting lines will change and bets right before they do. Some use computer programs to bet faster than humans can.

How much profit you make compared to how much you bet. Sustained positive ROI is rare and hard-earned.

When a sportsbook is slow to update a number, the price you see may be stale. It can still move or be rejected before your bet is accepted — a stale line is not guaranteed value and not a command to bet.

A coin that landed heads five times in a row is not "due" for tails — the next flip is still 50/50. Games do not remember your last bet.

You and a friend bet each other directly. No book takes a cut, but no book makes the loser pay either.

You keep winning and it feels like you cannot miss. Fun to ride — but a streak is a record of what already happened, not a reason the next bet wins.

The outcome was decided before anyone placed a fair bet. It is a crime, and it is why books and leagues watch betting patterns so closely.

How often you cash. You can hit 55% and still lose if the prices are bad.

The number is too short. You are not being paid enough.

Someone in the stands sees the point end a few seconds before the TV and the sportsbook do, and a partner bets on what already happened. It is not match fixing — nothing about the game changes — but it breaks the ticket conditions at essentially every major event, has led to arrests under betting-integrity laws in some places, and books answer it with in-play bet delays, quick suspensions and voided tickets.

Do not spend a team you will badly need later on a week where a safer option exists.

Surviving with half the pool is worth less than surviving with a few. A less popular pick can be worth a little extra risk.

Plan the whole season, so taking the safest team every week does not leave you with only weak teams late.

Circa adds two holiday picks. Use up every team that plays on Thanksgiving and you cannot survive that leg.

Pick two winners that week. If either one loses, you are out.

Lost early? Some pools let you pay again to get back in.

Your bet is in serious trouble or probably finished.

Pick 3 or more teams and the book builds all the smaller parlays for you — one loss doesn't sink everything.

Like two if-bets running forward AND backward at once — spreads your risk across both orders.

The head start you buy on every leg of a teaser — bigger head start, smaller payout.

Buy 6 points on two NFL spreads only when those points carry each leg across both 3 and 7, the margins NFL games land on most.

What the book hands back if you win — your bet plus your winnings.

How many different parlays your teams can make. Round robins are built from these combinations.

⚡ Quick Reference: Understanding Odds

Negative Odds (-150)

Bet $150 to win $100

Positive Odds (+130)

Bet $100 to win $130

Standard Juice (-110)

Bet $110 to win $100 — the extra $10 is the book's cut

Open calculators & diagrams →

⚠️ Remember: Sports betting should be fun. Only bet what you can afford to lose. Set a budget and stick to it.