noun A device for lifting heavy objects, especially one for raising the axle of a motor vehicle off the ground so that a wheel can be changed or the underside inspected. A playing card bearing a representation of a soldier, page, or knave, normally ranking next below a queen. A socket with two or more pairs of terminals designed to receive a jack plug. In lawn bowling, the small ball at which the players aim. A game played by tossing and catching small round pebbles or star-shaped pieces of metal or plastic. Used as a form of address to a man whose name is not known. A lumberjack. A steeplejack. The figure of a man striking the bell on a clock. A small version of a national flag flown at the bow of a vessel in harbor to indicate its nationality. Money. A device for turning a spit. A part of the mechanism in a spinet or harpsichord that connects a key to its corresponding string and causes the string to be plucked when the key is pressed down. A marine fish that is typically laterally compressed with a row of large spiky scales along each side. Jacks are important in many places as food or game fish. The male of some animals, especially a merlin or an ass. Used in names of animals that are smaller than similar kinds, e.g., jacksnipe. short for jack shit short for jackrabbit
noun another term for blackjack (sense 5) A sleeveless padded tunic worn by foot soldiers.
verb Take (something) illicitly; steal. (his MO in the studio remains the same—jack other people's tracks and present them in a new context)
adjective Tired of or bored with someone or something. (people are getting jack of strikes)