wager - wa·ger (wā′jər)

n.
1.a. An agreement under which each bettor pledges a certain amount to the other depending on the outcome of an unsettled matter.
b. A matter bet on; a gamble.
2. Something that is staked on an uncertain outcome; a bet: a wager of $20.
3. Archaic A pledge of personal combat to resolve an issue or case. v.tr .
To risk or stake (an amount or possession) on an uncertain outcome; bet.
v.intr.
To make a bet. https://www.thefreedictionary.com/Wager