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Phrase(s): answer to someone
1. Fig. to explain or justify one’s actions to someone. (Usually with have to.) • If John cannot behave properly, he’ll have to answer to me. • The car thief will have to answer to the judge. 2. Fig. [in the hierarchy of the workplace] to be under the supervision of someone; to report to someone. (See also report to (someone or something).) • You will answer directly to Mr. Wright. • I answer only to the boss.
McGrawhill's American Idioms And Phrasal Verbs
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Explain or justify something to someone, as in If Mary doesn't help us finish this project, she'll have to answer to the boss. This expression was at first used mainly for replying to legal charges. [c. A.D. 950]
American Heritage Idioms