tied to somebody’s apron strings
US /taɪd tu ˈsʌm.bɑː.diz ˈeɪ.prən strɪŋz/
UK /taɪd tu ˈsʌm.bɑː.diz ˈeɪ.prən strɪŋz/

1.
离不开他妈妈, 过于依赖
to be too dependent on someone, especially one's mother
:
•
He's still tied to his mother's apron strings, even though he's 30 years old.
他都30岁了,还离不开他妈妈。
•
It's time for him to cut the cord and stop being tied to his mother's apron strings.
他该独立了,别再离不开他妈妈了。