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Phrase(s): Don’t even think about (doing) it.
Do not do it, and do not even think about doing it. • John reached into his jacket for his wallet. The cop, thinking John was about to draw a gun, said, "Don’t even think about it.", Phrase(s): Don’t even think about it (happening).
Do not think about something like that happening, as the mere thought of it is so bad. (Compare this with Don’t even think about (doing) it.) • Mary: Oh, those cars almost crashed! How horrible! Fred: Don’t even think about it. • Sally: If the stock market crashes, we’ll lose everything we have. Sue: Don’t even think about it!
McGrawhill's American Idioms And Phrasal Verbs