Definitions for heavy hitter
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Random House Webster's College Dictionary
heav′y hit′ter(n.)
a very important or influential person.
Category: Common Vocabulary
Princeton's WordNet
heavy hitter(noun)
an influential person who works hard to promote the causes they are interested in
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"heavy hitter." Definitions.net. STANDS4 LLC, 2013. Web. 25 May 2013. <http://www.definitions.net/definition/heavy hitter>.