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Wiktionary
fold up

vb. (context idiomatic English) To make or become more compact by folding.

WordNet
fold up
  1. v. bend or lay so that one part covers the other; "fold up the newspaper"; "turn up your collar" [syn: fold, turn up] [ant: unfold]

  2. become folded or folded up; "The bed folds in a jiffy" [syn: fold]