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general::
Phrase(s): I’m not kidding.
I am telling the truth.; I am not trying to fool you. • Mary: Those guys are all suspects in the robbery. Sue: No! They can’t be! Mary: I’m not kidding! • John (gesturing): The fish I caught was this big! Jane: I don’t believe it! John: I’m not kidding!
McGrawhill's American Idioms And Phrasal Verbs