a person seized or held as security for the fulfilment of a condition
人质。
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hold (或take )someone hostage seize and keep someone as a hostage把某人劫持为人质 -
a hostage to fortune an act, commitment, or remark which is regarded as unwise because it invites trouble or could prove difficult to live up to 招惹麻烦(或不明智、很难做到)的行为(或许诺、意见),惹风险之事making objectives explicit is to give a hostage to fortune . 讲明目标就要惹起风险
"Middle English: from Old French, based on late Latin