/fəʊld/

to bend something, especially paper or cloth, so that one part of it lies on the other part, or to be able to be bent in this way

折叠，对折(尤指纸或布);可折叠，可对折

He had a neatly folded handkerchief in his jacket pocket.

他的上衣口袋里有一方叠得整整齐齐的手帕。

Will you help me to fold (up) the sheets?

你能帮我把床单叠起来吗?