All’s Fair in Love and War

Meaning:
During situations where love is at stake or during war, people are not bound by rules of fair play.

Example:
Ben lives by the saying ‘all’s fair in love and war’. He has got his eyes set on Clara and will resort to all means to be with her.

Did you know?
The origins of this idiom came from John Lyly, a poet, who wrote “The rules of fair play do not apply in love and war.” It is often used to justify cheating.