wager (n.) Look up wager at Dictionary.com
c. 1300, wajour "a promise, a vow, something pledged or sworn to;" also "a bet, a wager; stakes, something laid down as a bet," from Anglo-French wageure, Old North French wagiere (Old French gagiere, Modern French gageure) "pledge, security," from wagier "to pledge" (see wage (n.)).
wager (v.) Look up wager at Dictionary.com
c. 1600 (intransitive); 1610s (transitive), from wager (n.). Related: Wagered; wagering.