heavy hitter

名词noun

1. 1(baseball) A player with a favorable batting average who is especially good at hitting the ball deep into the outfield or farther.
2. 2(sports, by extension) In any sport, a strong, physical player who is particularly effective.
3. 3idiomaticSomeone or something of considerable importance; a person who is a major decision maker or capable achiever; an especially significant organization or an especially functional object.