Read the following sentence.Ari had been very nervous before the audition, but now that he was finished and he saw the approval on everyone’s faces, he knew he had nailed it.

In this sentence, “he knew he had nailed it” means Ari realized he had done very well on the audition. The approval on everyone’s faces supports that meaning, so the phrase matches “to do something well,” not the literal idea of striking something down.

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