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Look out! Watch where you're going! Be more careful! Hey, watch it! You nearly knocked my drink over. Watch it, pal, you're in my way!
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!
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.
1 used to warn somebody to be careful: Watch it! There’s a car coming.
2 used to tell somebody that they are behaving badly and will be punished if they continue: If you do that again, there’ll be trouble, so watch it.
exclam. Be careful!; Watch your step!; Careful of what you say! You’re walking on thin ice. Watch it!