Step 1: Understanding the idiom.
The idiom "to throw in the towel" originates from boxing. When a fighter’s trainer throws a towel into the ring, it signals that the fighter is surrendering or giving up the fight. Step 2: Analyzing the options.
- (1) To start a fight: This is the opposite of the meaning of the idiom.
- (2) To surrender or give up: This is the correct meaning of the idiom.
- (3) To clean up a mess: This is unrelated to the idiom's meaning.
- (4) To challenge someone: This is also unrelated. Step 3: Conclusion.
The correct meaning is “to surrender or give up.” Therefore, the correct answer is (2).