all's fair in love and war
idiom
—used to describe a situation in which people do not follow the usual rules of behavior and do things that are normally considered unfair
Sure, it was underhanded to steal his customers, but all's fair in love and war.
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“All's fair in love and war.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/all%27s%20fair%20in%20love%20and%20war. Accessed 5 Nov. 2024.
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Merriam-Webster unabridged
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