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. (Finally, lower the jack so the wheel is back down on the road.) A playing card bearing a representation of a soldier, page, or knave, normally ranking next below a queen. (Notice also that it is not legal for East to put the jacks in the front hand, because it would then not be possible to make a middle hand that was better and a back hand that was better still from the remaining ten cards.) A socket with two or more pairs of terminals designed to receive a jack plug. (The right side is home to an earphone jack, power socket and, under a cover, a USB 2.0 port.) In lawn bowling, the small ball at which the players aim. (Lawn bowling required four bowls for each player and a jack for a goal.) A game played by tossing and catching small round pebbles or star-shaped pieces of metal or plastic. (In Korea, young girls play a game of jacks, tossing small stones onto the ground, throwing a ball up in the air, and and trying to pick the stones up before catching the ball.)
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. (At daylight we hoisted the jack for a pilot and a Delaware pilot came off, Boat C, but couldn't take us to New York.) 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. (Volume can be increased only by engaging more sets of strings and jacks.) 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. (On any dive one can easily spot angel fish, manta rays, hammerhead sharks, jacks and trevailles, barracudas… Finding Nemo would be impossible if he got lost here.) The male of some animals, especially a merlin or an ass. (A mule results from a cross between a female horse, or mare, and a male donkey, or jack.) Used in names of animals that are smaller than similar kinds, e.g., jacksnipe. (The Jack Snipe is an extremely difficult bird to see, partly because they are not very common but mostly because they are so well-camouflaged they will often sit unnoticed and let you walk past them.) short for jack shit short for jackrabbit (Suddenly, a Jack, another type of fighter, got behind.)
noun another term for blackjack (sense 5) A sleeveless padded tunic worn by foot soldiers.
adjective Tired of or bored with someone or something.