American English

Definition of boo exclamation from the Oxford Advanced American Dictionary

     

    boo

     exclamation,noun
    exclamation, noun
    NAmE//bu//
     
     
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  1. 1 a sound that people make to show that they do not like an actor, speaker, etc. “Boo!” they shouted. “Get off the stage!” The speech was greeted with loud boos from the audience.
  2. 2people shout Boo! when they want to surprise or frighten someone
  3. Idioms
      not say boo
       
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    1. 1to be very shy or gentle
    2. 2 to not say anything at all Walter looked at us, but he didn't say boo.
See the Oxford Advanced Learner's Dictionary entry: boo

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