一日一成语【218】under the thumb 受控于某人

under the thumb
[俗]在某人的掌股之下，受控于某人

Some teachers wish to keep their students under their thumbs.
有些老师希望学生们完全处于自己的影响之下。

Tom is unwilling to be under his father’s thumb, so he decided to leave his home.
汤姆不愿意受他爸爸的控制，所以决定离家出走。

注解：
under意指在下面，thumb意指大拇指；under the thumb系指在某人的大拇指底下，喻指被 掌握在某人手中、在某人的控制之下。