Fold, n.
 1. A doubling,esp. of any flexible substance; a part laid over on another part; a plait; a plication.
    Mummies . . . shrouded in a number of folds of linen.   --Bacon.
    Folds are most common in the rocks of mountainous regions.   --J. D. Dana.
 2. Times or repetitions; -- used with numerals, chiefly in composition, to denote multiplication or increase in a geometrical ratio, the doubling, tripling, etc., of anything; as, fourfold, four times, increased in a quadruple ratio, multiplied by four.
 3. That which is folded together, or which infolds or envelops; embrace.
    Shall from your neck unloose his amorous fold.   --Shak.
 Fold net, a kind of net used in catching birds.