法律英语词汇“preexisting-duty rule”的翻译、意思、用法、释义-法律词典

单词	preexisting-duty rule
释义	preexisting-duty rule 既有义务规则合同法上的一项规则，指如果一方当事人履行或允诺履行其本应履行的义务，该当事人并未因此而遭受损害。其中本应履行的义务，既可以是作为的义务，也可以是不作为的义务。既有义务规则的运用，意味着履行既有义务的允诺并不构成合同的有效对价。
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