noun
[ sing. ] a person who helps sb a lot and who they rely on, especially in an important job :
the President's right-hand man
noun
[ sing. ] a person who helps sb a lot and who they rely on, especially in an important job :
the President's right-hand man
Oxford Advanced Learner's English Dictionary. Оксфордский английский словарь для изучающик язык на продвинутом уровне. 2005