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English definition of “look out”

look out

verb uk phrasal verb with look   /lʊk/ us  
to watch what is happening and be careful: The police have warned shopkeepers to look out for forged notes. B1 said or shouted in order to tell someone that they are in danger: Look out! There's a car coming!
(Definition of look out from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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