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jack
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jack

Tool or machine for lifting, hoisting, or moving heavy weights, such as motor vehicles. A screw jack uses the principle of the screw to magnify an applied effort; in a car jack, for example, turning the handle many times causes the lifting screw to rise slightly, and the effort is magnified to lift heavy weights. A hydraulic jack uses a succession of piston strokes to increase pressure in a liquid and force up a lifting ram.

jack

In computing, small plug allowing users to connect peripherals to CPUs (central processing units).

jack

In music, the mechanism in the virginal, harpsichord, and similar instruments by which the strings are plucked. In a piano the jack accommodates the fall of the hammer from the string.



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