Throw in the towel
Meaning
To concede defeat or admit a struggle isn't worth continuing.
Usage
Used in both serious contexts and lighthearted ones to suggest stopping after persistent attempts.
Origin & History
Origins and dates here are approximate summaries. Many idioms have disputed or unknown origins, and not every date has been checked against a historical dictionary, so treat specific dates and stories as a starting point rather than a citation.
Comes from boxing when a trainer throws a towel into the ring to stop the fight.
Associated with prizefighting in the late 1800s when stopping a fight was as much about safety as defeat.