C 拇指　the short thick finger at the side of your hand

　This glove has a hole in the thumb.　这只手套的大拇指处有个洞。
　The baby sucked its thumb.　那婴孩吮吸大拇指。
　John always bites the thumbs at Jack's greedy action.　约翰总是对杰克的贪婪行为嗤之以鼻。

 ♣ be all (fingers and) thumbs　
笨手笨脚be very clumsy
　Harry tried to fix the chair, but he was all thumbs.　哈里想修理那把椅子，可他笨手笨脚的。
 ♣ stick out like a sore thumb　
显得别扭be very obvious or conspicuous and unpleasing
　The dinner is formal, if you don't wear the correct clothes you'll stick out like a sore thumb.　宴会是正式的，如果你着装不当，会显得很不得体。

　thumb　还可用作动词，意思是“以拇指翻（书页）;弄坏；翻阅；作搭车手势”。

［词源］古英语thuma（拇指手套）