n.[C]

1. （有时大写）男人；男孩；普通人
2. （有时大写）仆人；侍者；打杂工
3. （常大写）水手；海员；水兵
4. 起重机；千斤顶
   lift a car with a jack

   用千斤顶把汽车托起

5. （纸牌中的）“J”牌，杰克
6. 【电】插座；插口
7. 【船】船首旗
8. 公骡；公畜；长耳大野兔

vt.

1. 用起重机举起，用千斤顶托起
   We jacked the automobile in order to change a tire.

   我们用千斤顶把汽车托起换个轮胎。

n.

1. a device for lifting heavy objects, especially one for raising the axle of a motor vehicle.
2. a playing card bearing a representation of a soldier, page, or knave, normally ranking next below a queen.
3. (also jack socket) a socket designed to receive a jack plug.
4. (in bowls) a small white ball at which the players aim.
5. (also jackstone) a small round pebble or star-shaped piece of metal or plastic used in tossing and catching games.
   ▸ (jacks) a game played by tossing and catching jacks.
6. a small version of a national flag flown at the bow of a vessel in harbour.
7. N. Amer. informal money.
8. a device for turning a spit.
9. a part of the mechanism in a spinet or harpsichord that connects a key to its corresponding string.
10. a perch-like marine fish, typically with a row of large spiky scales along each side. [Family Carangidae: numerous species.]
11. the male of various animals, especially a merlin or (N. Amer.) an ass.
12. used in names of animals and plants that are smaller than similar kinds, e.g. jack pine.

v.

1. (jack something up) raise something with a jack.
2. (jack something up) informal increase something by a considerable amount.
3. (jack in/into) log into or connect up (a computer or electronic device).

n.

1. another term for blackjack (in sense ⁵).
2. a sleeveless padded tunic worn by foot soldiers. [ME: from OFr. jaque; origin uncertain, perh. based on Arab.]

adj.

v.