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Phrase(s): Watch it!
1. Inf. Be careful. • Rachel: Watch it! There’s a broken stair there. Jane: Gee, thanks. • Mary: Watch it! There’s a pothole in the street. Bob: Thanks. 2. Inf. Do not act or talk that way. • Sally: I really hate John! Sue: Watch it! He’s my brother! • Bill: You girls always seem to take so long to do a simple thing like getting dressed. Mary: Watch it!
McGrawhill's American Idioms And Phrasal Verbs
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Also, watch out. Be careful, as in Watch it as you go down that ladder, or Watch out, there are a lot of cars on this road. The first term dates from the early 1900s, the variant from the mid-1800s. Also see LOOK OUT.
American Heritage Idioms