B1
If you fold paper, cloth, etc., you bend it so that one part of it lies flat on top of another part.
Dictionary examples:
He folded his exam paper into a paper airplane and flew it to the teacher. (0.0)
I folded my pizza in half to eat it, but all the toppings escaped! (0.0)
She folded her rejection letter into a paper hat and wore it to the party. (0.0)
Will you help me to fold up the sheets? (22.2)
I folded the letter in half and put it in an envelope. (24.5)
He had a neatly folded handkerchief in his jacket pocket. (42.9)