"dirty pool." YourDictionary, n.d. Web. 18 December 2018. <https://www.yourdictionary.com/dirty-pool>.
dirty pool. (n.d.). Retrieved December 18th, 2018, from https://www.yourdictionary.com/dirty-pool
Origin of dirty pool
Probably an allusion to failing to follow the rules when playing billiards.
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