The phrase "Throw in the towel" is a common English idiom used to describe the act of quitting or surrendering, usually in the face of difficulty or defeat.
This expression originates from the sport of boxing. When a boxer is being badly beaten and their trainer or corner believes they cannot safely continue the fight, they would literally throw a towel into the ring. This action signals to the referee that they are conceding the match on behalf of their fighter, thus ending the fight.
Let's look at why the other options are not the correct meaning:
Therefore, the best description for the idiom "Throw in the towel" is "To give up".