千斤頂

jack(noun)

an instrument for lifting up a motor car or other heavy weight

You should always keep a jack in the car in case you need to change a wheel.

撲克紙牌的傑克(撲克紙牌中的J牌)

jack(noun)

the playing-card between the ten and queen, sometimes called the knave

The jack, queen and king are the three face cards.