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ball-buster

[bawl-buhs-ter]
noun Slang: Vulgar.
  1. an arduous, often unpleasant task.
  2. a person who makes great demands on others; taskmaster.
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Also called ball-break·er [bawl-brey-ker] /ˈbɔlˌbreɪ kər/.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018