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Difference between Drop a dime and Penny drops

drop a dime—(U.S. sl.) give information about a person or a situation discreetly (making a phone call):

  • You’d better tell her the truth—someone’s bound to drop a dime if you lie.

penny drops, the—(UK coll.) said when a person finally understands smth.:

  • I sat and thought for a moment and then the penny dropped.