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bust one's ass (third-person singular simple present busts one's ass, present participle busting one's ass, simple past and past participle busted one's ass or bust one's ass)

  1. (slang, Canada, US, vulgar) To work very hard, to put in a lot of effort.
  2. (slang, vulgar) To hurt or beat up.
    Say that again and I'm going to bust your ass.

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