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Phrase(s): put one’s finger on something
1. Lit. to touch something with one’s finger. • I put my finger on the button and pressed. • Put your finger on this spot and push hard. 2. Fig. to identify and state the essence of something. • That is correct! You have certainly put your finger on the problem. • When she mentioned money, she really put her finger on the problem.
McGrawhill's American Idioms And Phrasal Verbs