thumb

/θəm/

the thick short innermost digit of the forelimb

中文释义：拇指

He accidentally hit his thumb with a hammer while fixing the shelf.

他在修理架子时不小心用锤子砸到了拇指。

She gave a thumbs-up to show her approval of the plan.

她竖起大拇指表示赞同这个计划。