We found 6 dictionaries that define the word alls fair in love and war:

General (5 matching dictionaries)

1. all's fair in love and war: Merriam-Webster
2. all's fair in love and war: Oxford Learner's Dictionaries
3. All's fair in love and war: Cambridge Advanced Learner's Dictionary
4. all's fair in love and war: Wiktionary
5. All's fair in love and war: Dictionary.com

Miscellaneous (1 matching dictionary)

6. All's fair in love and war: Idioms

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