Noun
an influential person who works hard to promote the causes they are interested in
Source: WordNetheavy-hitter
Actually punching is a mistake; a heavy hitter will cut you with one shot. Alexis Arguello
Quicken Loans has a reputation as a heavy-hitter in the mortgage space. Source: Internet
This hybrid of Sour Diesel and Blueberry is an intense heavy-hitter with a high THC count, so if you’re a casual smoker, go slow and take it one hit at a time. Source: Internet