1
- 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起重器, 千斤顶。
2
- a playing card bearing a representation of a soldier, page, or knave, normally ranking next below a queen纸牌中的 "J"牌。
3
- （亦作jack socket）a socket with two or more pairs of terminals designed to receive a jack plug插座, 插孔。
4
- a small white ball in bowls, at which the players aim（草地滚木球戏中作靶子球的）小白球。
5
- （亦作jackstone）a small round pebble or star-shaped piece of metal or plastic used in tossing and catching games（抛接子游戏中用的）圆形的小鹅卵石（或星状的铁片或塑料片）。
5.1
jacks
a game played by tossing and catching such pebbles or pieces of metal抛接子游戏。
6
Jack
used to typify an ordinary man普通人, 男人：he had that world-weary look of the working Jack who'd seen everything.
他带着历尽沧桑的劳动者厌倦一切的神情。
ORIGIN: familiar form of the given name John.
6.1
- informal, chiefly US used as a form of address to a man whose name is not known〈非正式, 主美〉［用作对陌生人的一种称呼］老兄。
6.2
- N. Amer. informal a lumberjack〈北美, 非正式〉伐木工人。
6.3
- informal a detective or police officer〈非正式〉侦探; 警察。
6.4
- archaic a steeplejack〈古〉高空作业工人。
6.5
- the figure of a man striking the bell on a clock（时钟上）敲钟的人像。
7
- a small version of a national flag flown at the bow of a vessel in harbour to indicate its nationality船首旗（港口内船只上飘在船首的用于表示国籍的小旗）。
8
- mass noun US informal money〈美, 非正式〉钱。
9
- a device for turning a spit烤肉炙叉旋转器。
10
- 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.琴键拨子。
11
- 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鲹（一种海鱼, 鱼身两侧扁平, 各有一排多棘大鳞片, 是许多国家常见的食用与可供捕捉的鱼）。亦称POMPANO, SCAD. [originally a West Indian term.]
11.1
- Family Carangidae (the jack family): many genera and numerous species. The jack family also includes the horse mackerel, pilotfish, kingfishes, and trevallies.鲹科：多属, 众多种。鲹科鱼类还包括竹荚鱼、舟、鲛鱼和长鳍鲹。
12
- the male of various animals, especially a merlin or (US) an ass雄性动物（尤指公灰背隼或〈美〉公驴）。
13
- used in names of animals that are smaller than similar kinds, e.g. jack snipe用在比同类动物矮小的动物名称里, 如jack snipe.
短语
before one can say Jack Robinson
- informal very quickly or suddenly〈非正式〉说时迟那时快, 突然间, 一刹那。
every man jack
- informal each and every person (used for emphasis)〈非正式〉人人, 每个人 ［用于强调］ ：
they're spies, every man jack of them.
他们是间谍, 每个人都是。
I'm all right, Jack
- informal used to express selfish complacency.〈非正式〉（表示满足于自己没事的自私心理）老兄, 我没事。
jack of all trades (and master of none)
- a person who can do many different types of work but who is not necessarily very competent at any of them杂而不精的人, 三脚猫; 万能博士, 万金油。
on one's jack （或Jack Jones）
- Brit. rhyming slang on one's own〈英, 谐俚〉独自, 自个儿。
词源
late Middle English: from Jack, pet form of the given name John. The term was used originally to denote an ordinary man (sense 6), also a youth （mid 16th cent.）, hence the 'knave' in cards and 'male animal'. The word also denoted various devices saving human labour, as though one had a helper （senses 1, 3, 9, and 10, and in compounds such as JACKHAMMER and JACKKNIFE）; the general sense 'labourer' arose in the early 18th cent. and survives in CHEAPJACK, LUMBERJACK, STEEPLEJACK, etc. Since the mid 16th cent. a notion of 'smallness' has arisen, hence senses 4, 5, 7, and 13.
短语动词
jack someone around
- N. Amer. informal cause someone inconvenience or problems, especially by acting unfairly or indecisively〈北美, 非正式〉（尤指不公正或优柔寡断的行为）造成（某人）的不便, 给（某人）带来麻烦。
jack in （或into）
- informal log into or connect up (a computer or electronic device)〈非正式〉进入或连接（电脑系统或电子装置）。
jack something in
- Brit. informal give up or leave off from doing something, especially a job〈英, 非正式〉放弃（或停止）做某事（尤指工作）。
jack off
- vulgar slang masturbate〈粗俚〉手淫。
jack up
1
- informal inject oneself with a narcotic drug〈非正式〉给自己注射麻醉毒品。
2
- Austral. give up or refuse to participate in something〈澳〉放弃; 拒绝参与。
jack something up
1
- raise something, especially a vehicle, with a jack（用千斤顶）举起, 抬起某物（尤指车辆）。
1.1
- informal increase something by a considerable amount〈非正式〉（显著地）提高或增加：
France jacked up its key bank interest rate.
法国提高了主要的银行利率。
2
- NZ informal arrange or organize something〈新西兰, 非正式〉安排, 组织。
predic.
- Austral. /NZ tired of or bored with someone or something〈澳/新西兰〉厌倦, 厌烦：
people are getting jack of strikes.
人们逐渐开始厌烦罢工。
词源
late 19th cent.: from jack up 'give up'.