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Phrase(s): I’ll bite.
Inf. Okay, I will answer your question.; Okay, I will listen to your joke or play your little guessing game. • Bob: Guess what is in this box? Bill: I’ll bite. Bob: A new toaster! • John: Did you hear the joke about the used car salesman? Jane: No, I’ll bite.
McGrawhill's American Idioms And Phrasal Verbs