look out forsomeone or something

watch out for someone or something & look out forsomeone or something

1. to be on guard for someone or something; to be on watch for the arrival or approach of someone or something. •

Watch out for someone wearing a white carnation.

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Look out for John and his friends. They'll be coming this way very soon.

2. and look out; watch out Fig. to try to avoid a confrontation with someone or something. •

Watch out! That car nearly hit you!

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Look out for John. He's looking for you, and he's really mad.

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Thanks. I'd better look out.