heavy hitter

The phrase "heavy hitter" typically refers to a person or thing that is extremely influential, powerful, or capable of making a significant impact or achieving impressive results. In various contexts, it can be used to describe someone who is highly skilled, talented, successful, or influential in a particular field or industry. It often implies that the individual or entity possesses considerable influence, authority, or high levels of accomplishment, and can make a notable difference or leave a lasting impression.