"Jack"在英语中不一定是"杰克"

一、指人

All the workers want a pay increase, every man Jack of them.
全体工人无一例外地要求增加工资。（every man Jack 或every Jack one是“每个人”、“人人”的意思。）

Jack of all trades and master of none
万事皆通而一无所长的人

a Jack on both sides
模棱两可，两面派

Jack at a pinch
临时拉来帮忙的人

Jack among the maids
讨好女人的男子

Jack in the water
码头打杂工

cheep Jack
卖廉价货物的小贩

a Jack in office
自命不凡的小官吏，官僚

Jack the lad
（青少年帮派中的）头号人物

二、指物

His elder brother died of Yellow Jack in the West Indies.
（Yellow Jack指医学上的“黄热病”）

the Union Jack
英联合王国国旗

a Jack of straw
稻草人

to make one's Jack
赚很多钱

三、谚语中指人或物

All work and no play makes Jack a dull boy.
只工作不玩，聪明的孩子也会变傻。

All shall be well, Jack shall have Jill.
有情人终成着属。

Jack would be a gentleman if he had money.
低微的人有钱也会成为绅士。

Jack is as good as his master.
伙计不比老板差，卑贱者未必不如高贵者。

Jacks are common to all that will play.
乐器对于所有想要弹奏的人都一样。（Jacks是古时类似钢琴的弹奏乐器。）