Throw your hand in
Definition 1 of 1
Pro Tip 1/3Colloquial Usage
Used informally, often in conversations among friends or in personal reflections. 
This game is too hard; I'm ready to throw my hand in.
Pro Tip 2/3Feeling Overwhelmed
Expresses feeling defeated or unable to continue due to difficulty or frustration. 
After failing the test again, he decided to throw his hand in.
Pro Tip 3/3Not Literal
It's a metaphorical expression and doesn't involve physical hands. 
I'm so tired of this project, I just want to throw my hand in.