wa•gerˈweɪ dʒər(n.)

1. something risked or staked on an uncertain event; bet.

2. the act of betting.

3. the subject or terms of a bet.

4. (v.t.)to risk (something) on the outcome of a contest, event, etc.; bet.

5. Hist. to pledge oneself to (battle) for the decision of a cause.

6. (v.i.)to make or offer a wager; bet.

Origin of wager:

1275–1325; ME wajour, wager solemn pledge < AF wageure=wage(r) to pledge (see wage ) +-ure -ure

wa′ger•er(n.)