Give in

FOLD

Think of what a poker player might do with a weak hand, or how a piece of paper bends under pressure.

"Give in" is a phrase that can mean surrendering or yielding, which directly points to the answer "FOLD"—like folding a hand in poker when you quit the game. The word also plays on the literal act of folding something, but here it’s about conceding. It’s a straightforward clue where the definition does all the work.