English definition of Jack

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Definition of jack

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"Jack (n.) A portable machine variously constructed, for exerting great pressure, or lifting or moving a heavy body through a small distance. It consists of a lever, screw, rack and pinion, hydraulic press, or any simple combination of mechanical powers, working in a compact pedestal or support and operated by a lever, crank, capstan bar, etc. The name is often given to a jackscrew, which is a kind of jack..

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Jack :: Jack (n.) The wall-eyed pike.

Grasshopper :: Grasshopper (n.) In ordinary square or upright pianos of London make, the escapement lever or jack, so made that it can be taken out and replaced with the key; -- called also the hopper..

Jacksnipe :: "Jacksnipe (n.) A small European snipe (Limnocryptes gallinula); -- called also judcock, jedcock, juddock, jed, and half snipe..

Split :: Split (n.) the division by a player of one hand of blackjack into two hands, allowed when the first two cards dealt to a player have the same value; the player is usually obliged to increase the amount wagered by placing a sum equal to the original bet on the new hand thus created..

Jack :: "Jack (n.) A drinking measure holding half a pint; also, one holding a quarter of a pint..

Jacket :: "Jacket (v. t.) To put a jacket on; to furnish, as a boiler, with a jacket..

Supple-jack :: Supple-jack (n.) A climbing shrub (Berchemia volubilus) of the Southern United States, having a tough and pliable stem..

Bluefish :: Bluefish (n.) A large voracious fish (Pomatomus saitatrix), of the family Carangidae, valued as a food fish, and widely distributed on the American coast. On the New Jersey and Rhode Island coast it is called the horse mackerel, in Virginia saltwater tailor, or skipjack..

Jack :: "Jack (n.) A familiar nickname of, or substitute for, John..

Jacksnipe :: "Jacksnipe (n.) A small American sandpiper (Tringa maculata); -- called also pectoral sandpiper, and grass snipe..

Pea-jacket :: Pea-jacket (n.) A thick loose woolen jacket, or coat, much worn by sailors in cold weather..

Minute-jack :: Minute-jack (n.) A timeserver; an inconstant person.

Black-jack :: Black-jack (n.) The Quercus nigra, or barren oak..

Jak :: Jak (n.) see Ils Jack.

Natterjack :: Natterjack (n.) A European toad (Bufo calamita), having a yellow line along its back..

Knave :: Knave (n.) A playing card marked with the figure of a servant or soldier; a jack.

Caddow :: Caddow (n.) A jackdaw.

Cleading :: Cleading (n.) A jacket or outer covering of wood, etc., to prevent radiation of heat, as from the boiler, cylinder. etc., of a steam engine..

Basque :: Basque (n.) A part of a lady's dress, resembling a jacket with a short skirt; -- probably so called because this fashion of dress came from the Basques..

Sweater :: Sweater (n.) A woolen jacket or jersey worn by athletes.