Definition of fold up
2a : to cease resistance or exertion : give up : fail, quit the horse folded up in the homestretch the defense folded up under the savage attack the weak just get crushed; you can't blame them for folding up — K. M. Dodson b : to stop production or operation for lack of funds, support, or business success : go bankrupt : close up : close small businesses were folding up right and left
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