fèi​xīn

take trouble

费心 (費心) fèi​xīn
take trouble adjective
to expend mental effort, care, or attention on someone or something

He really put in a lot of effort to take care of the sick elderly person.

trouble you verb
a polite expression used when requesting a favor or acknowledging someone's effort

I'll have to trouble you to help me with this matter.

Frequency

Movie subtitles
3.55 per million appears in 2% of films
Written text
1.61 per million

Sources

Definitions
CC-CEDICT