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look out

look out

 
See:
look
part of speech: phrase
definition 1: to pay attention in order to avoid danger or harm.
Look out when you cross that intersection.Look out! There's a car!Look out for that branch! You'd better duck!
definition 2: (slang) used to tell someone in a rough manner to get out of one's way.
Look out, or I'll punch your face in!