Dirty pool

noun, slang

Definitions

Noun
  1. 1
    Foul play; misconduct; underhandedness. idiomatic, slang, uncountable

    "The thieves, in their turn, have developed a self-pity syndrome about the FBI, considering government surveillance to be dirty pool — unjustifiable interference with free enterprise."

  2. 2
    conduct that is unfair or unethical or unsportsmanlike wordnet

Etymology

Probably an allusion to failing to follow the rules when playing billiards. Compare not cricket.

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