Meaning of the word "big gun" in English

What does "big gun" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

big gun

US /bɪɡ ɡʌn/
UK /bɪɡ ɡʌn/
"big gun" picture

Idiom

1.

an important and influential person

Example:
They brought in a big gun from the main office to solve the problem.
When it comes to legal advice, she's a real big gun.
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