thumb

1. N-COUNT Your hand has four fingers and one thumb. 大拇指

She bit the tip of her left thumb, not looking at me. 她咬著左手的大拇指頭，也不看我。

2. V-T If you thumb a lift or thumb a ride, you stand by the side of the road holding out your thumb until a driver stops and gives you a lift. (站在公路邊) 豎起大拇指請求 (搭便車)

It may interest you to know that a boy answering Rory's description thumbed a ride to San Antonio. 可能讓你感興趣的是，有個和羅里描述相符的男孩豎起大拇指請求搭便車到圣安東尼奧。

3. PHRASE If you are under someone's thumb, you are under their control, or very heavily influenced by them. 在…的控制下; 深受…的影響

I cannot tell you what pain I feel when I see how much my mother is under my father's thumb. 我無法向你形容，當(dāng)我看到母親完全在父親的控制之下時我有多么痛苦。

4. green fingers→see green

5. rule of thumb→see rule