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Phrase(s): You ain’t seen nothing yet!
Rur. The best, most exciting, or cleverest part is yet to come! (The use of ain’t is a fixed part of this idiomatic expression.) • Alice: Well, the first act was simply divine. Sue: Stick around. You ain’t seen nothing yet! • Mary: This part of the city is really beautiful. Bill: You ain’t seen nothing yet!
McGrawhill's American Idioms And Phrasal Verbs