big gun
[noun]
Synonyms: notable, big boy, big cheese, big noise, big shot, big wheel, chief, great gun, high-muck-a-muck, leader

[TahlilGaran] English Synonym Dictionary ▲

ˌbig ˈgun noun [countable]
informal a person or company that has a lot of power and influence:
one of the party’s big guns

[TahlilGaran] Dictionary of Contemporary English ▲

big gun
[informal]
an important or powerful person in a group or organization.
She's a big gun in city politics.

[TahlilGaran] English Idioms Dictionary ▲

big gun
• big cheese/gun/wheel
an important person, a leader
The new director was a big wheel in his previous company but he is not so important now.

My uncle is a big cheese in his company so you should be very nice to him.

[TahlilGaran] English Idioms Dictionary ▲