foldfoldfolds2nouna line that is made when you bend cloth or paperfoldfoldfoldsfoldedfolding1verb (folds, folding, folded) (alsofold up)1to bend something so that one part is on top of another part: I folded the letter and put it in the envelope. Fold up your clothes.oppositeunfold2to be able to be made smaller in order to be carried or stored more easily: a folding chair This table folds up flat.fold your armsIf you fold your arms, you cross them in front of your chest: She folded her arms and waited. see Picture Dictionary for video