How is “throw in the towel” used?

In Front of the Class (2008), one line is: “Why don't you just throw in the towel and come home, huh?”

Which movie is “throw in the towel” from?

The clip at the top of this page is from Front of the Class (2008).

to admit that you have been defeated and stop trying

informal · Heard in 4 moviesPlay Idioms

Definitions from the Oxford Advanced Learner's Dictionary, 9th edition

Why don't you just throw in the towel and come home, huh?

Said in 8 films · #1