GNU Collaborative International Dictionary of English

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Found 2 definitions 

  1.       
Bo (), interj. [Cf. W. bw, an interj. of threatening or frightening; n., terror, fear, dread.] An exclamation used to startle or frighten. [Spelt also boh and boo.]

    [1913 Webster]

    
      
    
  2.       
boo v. to show displeasure (after a performance or speech) by making a prolonged sound of “boo”.

    [WordNet 1.5]

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