Heavyweight
Meaning: a person who is important and influential; a leader in a particular field
Example: The two important and well-known authors John Steinbeck and Ernest Hemingway are heavyweights in American literature. You cannot dismiss the importance and influence of heavyweight Steven Spielberg on the movie industry.
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Example: The two important and well-known authors John Steinbeck and Ernest Hemingway are heavyweights in American literature. You cannot dismiss the importance and influence of heavyweight Steven Spielberg on the movie industry.