all's fair in love and war

idiom

Definition of all's fair in love and war

used to describe a situation in which people do not follow the usual rules of behavior and do things that are normally considered unfairSure, 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.” The Merriam-Webster.com Dictionary, Merriam-Webster Inc., https://www.merriam-webster.com/dictionary/all's%20fair%20in%20love%20and%20war. Accessed 23 January 2020.

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out of the ordinary or unreasonable

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