To double over upon itself; lay or bring one part of over or toward another by bending; bend over: used of things thin and flexible, or relatively so, as a piece of cloth, a sheet of paper, a stratum of rock, etc.: often with up.To bring together or place over each other, as two correlated parts: as, to fold together the ends of a piece of cloth; to fold one's arms or one's hands.To inclose in a fold or in folds; wrap up; cover up or hide away.To inclose in or as in the arms; embrace.To throw down; overthrow; cause to yield.To become doubled upon itself; become bent so that one part lies over upon another.To infold; embrace.To yield; give way; fail.n. A double or bend in a more or less flexible substance, as cloth; a flexure, especially one so extensive as to bring the parts on either side of the line of bending near together.n. The parts which are brought together by bending or folding, or one of them; specifically, a plait in a garment or in drapery: as, a broad fold of cloth.n. In entomology, a plica or ridge, generally inclined to one side, appearing as if the surface had been folded.n. plural Involved parts of a complex whole; windings: a complex arrangement or constitution; intricacy.n. A clasp; an embrace.n. A sheaf or bundle, as of straw.n. See the adjectives.n. A place of protection or inclosure for domestic animals, usually for sheep.n. Hence A flock of sheep.n. A limit; a boundary.n. A farm-yard.n. The inclosure of a farm-house.To confine, as sheep, in a fold.To confine sheep in a fold.n. The earth; earth.n. A multiplicative suffix, attached to numerals, as in twofold, threefold, fourfold, etc., in algebra n-fold, etc., signifying ‘two, three, four, etc., n, etc., times as much’; so in many-fold, of which the older form, with modified meaning, remains in manifold.n. In geology, a bend in strata varying from a monoclinal or a simple change in the inclination of the beds with a dip still in the same direction as before, through anticlinals and synclinals, which have respectively opposing and converging dips on each side of a central axis, to overturned, collapsed, and fan-shaped folds, with very irregular dips. Folds are believed to be due to the compressive strains in the earth's crust. Compare monoclinal, anticlinal, synclinal, isocline,dome, basin, 9, etc.n. In the Brachiopoda, a term applied with distinctive value to the median elevation of the shell, which is more or less pronounced in all except atrematous genera.