big gun

noun

Slang.

1. an influential or important person or thing.

   He's a big gun in science.

big gun

noun

1. informal,  an important or influential person

Related Words

• big-name 
• distinguished 
• esteemed 
• famed 
• high-ranking www.thesaurus.com
• illustrious 
• noted 
• outstanding 
• preeminent 
• prominent 
• renowned 
• well-known