pull strings
US /pʊl strɪŋz/
UK /pʊl strɪŋz/

1.
走后门, 利用关系
to use one's influence with others to gain an advantage or special favor
:
•
He had to pull strings to get his son into that exclusive school.
他不得不走后门才让儿子进了那所贵族学校。
•
She's good at pulling strings to get what she wants.
她很擅长走后门来达到目的。