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boo1  audio  (b) KEY 

NOUN:
pl. boos
  1. A sound uttered to show contempt, scorn, or disapproval.
  2. Informal Any sound or word: You never said boo to me about overtime.
INTERJECTION:
Used to express contempt, scorn, or disapproval or to frighten or surprise another.
VERB:
booed, boo·ing, boos
VERB:
intr.
To utter a boo.
VERB:
tr.
To express contempt, scorn, or disapproval of by booing: booed the singer off the stage.
ETYMOLOGY:
Imitative


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