Definition of “right-hand” - Learner’s Dictionary

right-hand

adjective [ always before noun ] uk us /ˌraɪtˈhænd/

A2 on the right of something:

On the right-hand side you'll see a sign.
sb's right-hand man/woman

the person that you most trust and depend on, especially at work

(Definition of “right-hand” from the Cambridge Learner's Dictionary © Cambridge University Press)