Collins COBUILD Advanced Learner's English Dictionary - hitter

(hitters) 1. In sports, you can use hitter to say how good someone is at hitting the ball. The Georgian, aged 19, is not one of the game’s big hitters. N-COUNT: adj N 2. If you refer to someone such as a politician or a businessman as a heavy hitter or a big hitter, you mean that they are powerful and influential. ...friendships with heavy hitters like European industrialist Carlo De Benedetti. N-COUNT: adj N