Definition of watch out for phrasal verb from the Oxford Advanced American Dictionary

 

watch out for

 phrasal verb
phrasal verb
 
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Phrasal Verbs

    watch out for somebody/something

     
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  1. 1to make an effort to be aware of what is happening, so that you will notice if anything bad or unusual happens The cashiers were asked to watch out for forged banknotes.
  2. 2to be careful of something Watch out for the stairs—they're steep.
See the Oxford Advanced Learner's Dictionary entry: watch out for