jack

noun

/dʒæk/

Idioms

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[countable] a device for raising heavy objects off the ground, especially vehicles so that a wheel can be changed千斤顶，起重器（换车轮时常用）Topics Transport by car or lorryc2
[countable] an electronic connection between two pieces of electrical equipment（电）插孔，插座，插口；塞孔Topics Engineeringc2
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[countable] (in a pack of cards) a card with a picture of a young man on it, normally worth more than a ten and less than a queenJ 牌；杰克
- the jack of clubs梅花 J
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- ace
- card
- cut
- deal
- gambling
- hand
- jack
- shuffle
- suit
- trump
[countable] (in the game of bowls滚木球游戏) a small white ball towards which players roll larger balls靶子球（白色，较其他球小）
jacks
[plural] a children’s game in which players bounce a small ball and pick up small metal objects, also called jacks, before catching the ball抛接子游戏（儿童游戏）Topics Games and toysc2
(also jack shit taboo)
[uncountable] (North American English, slang) (usually used in negative sentences通常用于否定句) anything or nothing at all丝毫，根本，一点儿（不）
- You don't know jack.你什么都不知道。

Word Originlate Middle English: from Jack, familiar form of the given name John. The term was used originally to denote an ordinary man, 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 (sense (1), and in compounds such as jackhammer and jackknife); the general sense ‘labourer’ arose in the early 18th cent. and survives in lumberjack, steeplejack, etc. Since the mid 16th cent. a notion of ‘smallness’ has arisen, hence senses (4) and (5).

Idioms

all work and no play (makes Jack a dull boy)

(saying) it is not healthy to spend all your time working; you need to relax too只工作不玩耍，聪明的孩子也变傻

I’m all right, Jack

(British English, informal) used by or about somebody who is happy with their own life and does not care about other people’s problems我没事就好，好在我没事（别人的事我是不管的）

a jack of all trades

a person who can do many different types of work, but who perhaps does not do them very well博而不精的人；万金油

jack

verb

/dʒæk/

(North American English, informal)

Verb Forms

present simple I / you / we / they jack	/dʒæk/ /dʒæk/
he / she / it jacks	/dʒæks/ /dʒæks/
past simple jacked	/dʒækt/ /dʒækt/
past participle jacked	/dʒækt/ /dʒækt/
-ing form jacking	/ˈdʒækɪŋ/ /ˈdʒækɪŋ/

Phrasal Verbs

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jack something | jack somebody (for something) to steal something from somebody, especially something small or of low value偷，悄悄拿走，窃取（尤指小的或不值钱的东西）
- Someone jacked my seat.有人偷偷占了我的座位。
Word Originlate Middle English: from Jack, familiar form of the given name John. The term was used originally to denote an ordinary man, 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 (sense (1), and in compounds such as jackhammer and jackknife); the general sense ‘labourer’ arose in the early 18th cent. and survives in lumberjack, steeplejack, etc. Since the mid 16th cent. a notion of ‘smallness’ has arisen, hence senses (4) and (5).

jack

adjective

/dʒæk/

[not before noun] (Australian English)

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jack of somebody/something tired of or bored with somebody/something（对…）厌倦，厌烦
Word Originlate Middle English: from Jack, familiar form of the given name John. The term was used originally to denote an ordinary man, 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 (sense (1), and in compounds such as jackhammer and jackknife); the general sense ‘labourer’ arose in the early 18th cent. and survives in lumberjack, steeplejack, etc. Since the mid 16th cent. a notion of ‘smallness’ has arisen, hence senses (4) and (5).