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Related to wager: wagger
1. an agreement or pledge to pay an amount of money as a result of the outcome of an unsettled matter
2. an amount staked on the outcome of such a matter or event
3. wager of battle (in medieval Britain) a pledge to do battle for a cause, esp to decide guilt or innocence by single combat
4. wager of law English legal history a form of trial in which the accused offered to make oath of his innocence, supported by the oaths of 11 of his neighbours declaring their belief in his statements