throw in the towel
Upper Intermediate (B2)informal
Stop trying because you have accepted you cannot succeed.
"After three failed attempts, he finally threw in the towel."
Hear it in context

I Tried Boxing KSI..
JasonTheWeen · 22:19
Throw in the towel?
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[Co-Stream] Call of Duty League Major III Qualifiers | Week 2 Day 2
Call of Duty · 214:13
Throw in the towel.

26 IMPORTANT Business English Idioms + QUIZ
Hey Lady! English Speaking Community · 14:33
You throw in the towel.

I Tried Boxing KSI..
JasonTheWeen · 22:27
Then I throw in the towel.

I Tried Boxing KSI..
JasonTheWeen · 22:38
Then we throw in the towel.