thumb1/θʌm; θʌm/n [C]1 the short thick finger on the side of your hand which helps you to hold things(大)拇指see picture at见 HAND1 图2 be under sb's thumb if you are under someone's thumb, they control everything you do 完全在某人的控制下3 give sth the thumbs up/down to say you approve or disapprove of something 赞成/不赞成某事
thumb2v thumb through sthphr v to quickly look at each page of a book, magazine etc 匆匆翻阅﹐浏览〔书﹑杂志等〕