jack-knife是什么意思

vi. 中间呈V形弯

英文词源

jack-knife (n.): also jackknife, large pocket knife, 1711, probably American English, "perh[aps] associated with some sense of JACK sb.1, but compare jackleg knife" [OED]; see jack + knife (n.). Jackleg was a U.S. colloquial term of contempt from c. 1850. On another theory, so called because it originally was associated with sailors. As a kind of swimming dive, from 1922. As a type of tractor-trailer accident, 1966. Both from the notion of folding, as the knife does.
jack-knife (v.): 1776, "to stab," from jack-knife (n.). Intransitive meaning "to fold or bend" the body is said to date from the time of the American Civil War. The truck accident verbal sense is from 1949. Related: Jackknifed; jackknifing.

1. This guy, Jack Smith, does he go by the name of Jackal?: 这个叫杰克·史密斯的家伙是不是还有个名字叫杰凯尔？

2. Jack had attended these meetings as a matter of routine for years.: 数年来，杰克把参加这些会议当成是例行公事。

3. Auntie Hilda and Uncle Jack couldn't fuss over them enough.: 希尔达姨妈和杰克姨父对他们宠爱有加。

4. Jack took out his notes and talked for just under an hour.: 杰克掏出他的笔记，讲了将近一个小时。

5. An American judge yesterday dismissed murder charges against Dr Jack Kevorkian.: 昨天一个美国法官驳回了对杰克·凯沃尔基安医生的谋杀指控。