She has Rachel firmly under her thumb.是什么意思？

She has Rachel firmly under her thumb.

她把雷切尔牢牢地抓在手心里。

she

pron. 她，它；

例句
Her lover walked out on her after she had aborted their child.
她的情人在她打掉胎儿后甩了她。

has

v. 有( have的第三人称单数 )，（亲属关系中）接受，拿，买到；

例句
...the operation a patient has had.
病人做过的手术

Rachel

adj.& n. （化妆品的）浅黄褐色（的）；

例句
It was entirely in character for Rachel to put her baby first...
把自己的婴孩放在第一位，这完全符合雷切尔的性格。

firmly

adv. 坚固地，稳固地，坚定地，坚决地；

例句
A united Germany must be firmly anchored in NATO if Europe is to remain stable...
欧洲要保持稳定，德国必须统一并固守北约。

under

prep. 在…下面，在表面之下，在…的假定表面或掩饰下，少于，小于，在…情况下；adv. 在下面，少于，在水下，在昏迷中；adj. 较低的，下面的；

例句
...efforts to acquaint the public with their rights under the new law...
为使公众熟悉新法律所赋予的权利而作出的努力

her

pron. (she的宾格)她，(she的所有格)她的，她，指某个国家，（一艘）船；

例句
There was a terrible sadness in her eyes...
她眼神中流露出深深的悲伤。

thumb

n. 拇指，（手套的）拇指部份；vi. 翘起拇指请求搭乘（过路汽车），示意请求搭便车，翻阅；vt. 翻阅，作搭车手势，用拇指翻脏[翻坏]（书页等）；

例句
He took the pen between his thumb and forefinger.
他用拇指和食指捏着笔。