1. phrasal verbIf you fold something up, you make it into a smaller, neater shape by folding it, usually several times.
 She folded it up, and tucked it into her purse. [VERB noun PARTICLE]
 He folded up his paper and put it away. [VERB PARTICLE noun]
 2.   See also  fold [sense 4], fold-up
  See full dictionary entry for  fold