right-hand man
noun /ˌraɪt hænd ˈmæn/
/ˌraɪt hænd ˈmæn/
[singular]- a person who helps somebody a lot and who they rely on, especially in an important job
- the President’s right-hand man
- The former newspaper editor became David Cameron's right-hand man in Downing Street.
- He agreed to the deal after consulting his lawyer and right-hand man, Charles Alton.