big hitter

noun [C] informal

Definition

› a person or company that is very well known and has a lot of influence, or a product that is very successful: He has developed a reputation as a big hitter in the banking sphere. The companies that are involved include five big hitters from the FTSE 100. We can help you identify the stocks that will be the big hitters of the future. → See also heavy hitter

(Definition of big hitter noun from the Cambridge Business English Dictionary © Cambridge University Press)