A wager is a bet: an agreement where people risk something valuable (usually money) on the outcome of an event they're uncertain about. If you're right, you win; if you're wrong, you lose what you risked.

When two friends wager five dollars on which team will win the Super Bowl, each puts up five dollars. Whoever guesses correctly keeps both amounts. Professional gamblers place wagers at casinos or racetracks, trying to predict outcomes to win money.

The word is related to the idea of risking something you have, such as your pay or belongings, on an uncertain outcome. Today, making a wager means putting something at stake based on your prediction or confidence. You might wager your allowance, your dessert, or even something intangible like bragging rights.

People also use wager metaphorically. A scientist might say, “I'd wager that this experiment will succeed,” to express strong confidence without literally betting money.

While friendly wagers can add excitement to watching sports or playing games, gambling can cause serious problems for some people, so it's important to be careful and follow the rules where you live.