•be capable of a forceful blow; also, deliver a forceful blow.
•by extension, to have a powerful effect or impact
•have a powerful effect on someone
•An important, powerful, and/or
influential individual or
organization.
•The state of having power and being able to execute that power.
•those in respect of their profession, sport, or any competence hierarchy that are at the top of their game.
"Although, Mike Tyson sounds like a 12 year old girl when he speaks, don't let that sweet sounding voice fool you; that man is a heavy hitter, and will
knock you out with a swift blow."
"A group of
financial heavy hitters held a meeting in Dubai's Burj Al Arab Jumeirah, the most luxurious hotel on planet earth."