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.

       只工作不玩耍，聪明的孩子也会变傻。

       All shall be well, Jack shall have Jill.

       有情人终成眷属。

       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。）

（来源：英语学习网）