一、用來指人
every man Jack, every Jack one 每個人、人人
Jack of all trades and master of none 萬事皆通而一無所長的人
a Jack on both sides 模稜兩可，兩面派
Jack at a pinch 臨時拉來幫忙的`人
All work and no play makes Jack a dull boy. 諺語：只工作不玩，聰明的孩子也會變傻。
All shall be well, Jack shall have Jill. 諺：有情人終成著屬。
Jack among the maids 討好女人的男子
Jack would be a gentleman if he had money. 諺語：低微的人有錢也會成為紳士。
Jack is as good as his master. 諺：夥計不比老闆差，卑賤者未必不如高貴者。
Jack in the water 碼頭打雜工
cheep Jack 賣廉價貨物的小販
a Jack in office 自命不凡的小官吏，官僚
Jack the lad (青少年幫派中的)頭號人物
二、指物
Yellow Jack 醫學上的“黃熱病”
Jacks are common to all that will play.
諺語：樂器對於所有想要彈奏的人都一樣。Jacks是古時類似鋼琴的彈奏樂器。
a Jack of straw 稻草人
to make one's Jack 賺很多錢
