right hand man
[noun]
Synonyms: girl Friday, man Friday, right hand

[TahlilGaran] English Synonym Dictionary ▲

ˌright-hand ˈman noun [singular]
the person who supports and helps you the most, especially in your job:
John is Bill’s right-hand man and has put a lot of time into the team.

[TahlilGaran] Dictionary of Contemporary English ▲

right-hand man
(someone's) right-hand man/woman
someone who helps you with your work and who you depend upon.
How will the Director cope without his right-hand man, who resigned yesterday due to ill health?

[TahlilGaran] English Idioms Dictionary ▲

right hand man
v. phr. A valued and indispensable assistant.
The chancellor of the university never goes anywhere without the vice chancellor, his right-hand man, whose judgment he greatly trusts.

[TahlilGaran] English Idioms Dictionary ▲