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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Kadder :: Kadder (n.) The jackdaw.

Skipjack :: Skipjack (n.) A name given to several kinds of a fish, as the common bluefish, the alewife, the bonito, the butterfish, the cutlass fish, the jurel, the leather jacket, the runner, the saurel, the saury, the threadfish, etc..

Spinet :: Spinet (n.) A keyed instrument of music resembling a harpsichord, but smaller, with one string of brass or steel wire to each note, sounded by means of leather or quill plectrums or jacks. It was formerly much used..

Jack :: Jack (n.) A sawhorse or sawbuck.

Jack :: Jack (n.) A device to pull off boots.

Roundabout :: Roundabout (n.) A short, close jacket worn by boys, sailors, etc..

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

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

Cheap-jack :: Cheap-jack (n.) Alt. of Cheap-joh.

Jakwood :: Jakwood (n.) See Jackwood.

Skipjack :: Skipjack (n.) A shallow sailboat with a rectilinear or V-shaped cross section.

Jackstay :: "Jackstay (n.) A rail of wood or iron stretching along a yard of a vessel, to which the sails are fastened..

Whimbrel :: Whimbrel (n.) Any one of several species of small curlews, especially the European species (Numenius phaeopus), called also Jack curlew, half curlew, stone curlew, and tang whaup. See Illustration in Appendix..

Paltock :: Paltock (n.) A kind of doublet; a jacket.

Jacksaw :: Jacksaw (n.) The merganser.

Jack :: "Jack (n.) A system of gearing driven by a horse power, for multiplying speed..

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.) An impertinent or silly fellow; a simpleton; a boor; a clown; also, a servant; a rustic..

Jackass :: Jackass (n.) A conceited dolt; a perverse blockhead.

Jackdaw :: "Jackdaw (n.) See Daw, n..