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Longman Dictionary of Contemporary English
heavy hitter
noun
EXAMPLES FROM OTHER ENTRIES
▪ The issue has drawn the attention of some of Hollywood's heavy hitters.
The Collaborative International Dictionary
heavy hitter

Hitter \Hit"ter\, n.

  1. One who hits or strikes; as, a hard hitter.

  2. (Baseball) The batter; as, there are two strikes on the hitter. heavy hitter

    1. A baseball player who gets many extra-base hits.

    2. A person who is very important or is very effective at his profession.

WordNet
heavy hitter

n. an influential person who works hard to promote the causes they are interested in

Usage examples of "heavy hitter".

It was time for a heavy hitter, and sure enough, Matt Braddock was up.

The festival had been under way for two days, and every heavy hitter in comedy entertainment from L.

Moravia, who shuttled back and forth between New York and Tokyo, palling around with some heavy hitter from Defense.