Acidic juice extracted from unripe or sour fruit, chiefly grapes but also crabapples, verjuice: (a) generally, or as a commodity, of unspecified purpose; (b) used in combs. or phrases specifying the type or intended or customary use of various vessels: ~ barel, barillum ad (pro) ~, botel ~, a barrel (bottle) for storing verjuice; (c) cook. as an ingredient in dishes or sauces; also, such considered with regard to its medicinal or wholesome properties [last quot.]; ~ of grapes, grapes ~; (d) cook. as a sauce; also, such considered with regard to its medicinal or wholesome qualities; also, sauce made with green herbs [= vert-sauce n.], whether or not containing verjuice; also fig. [quot. c1390]; ?also, the green color of such sauce [quot. c1400]; ~ sauce; mete ~, ?a pottage of white meat in green sauce; (e) as a tonic or medicine, usu. in the form of a drink mixed with other liquids; also as an ingredient of topical medications; also, ?as an herbal potion of astringent properties [quot. ?c1425]; (f) in prov. expression.