pusher; person or thing that pushes
General term for someone or something that pushes, often in physical or mechanical contexts.
The pusher on this machine broke down.
He works as a cart pusher.
drug pusher; drug dealer
Colloquial term for an illegal drug dealer; carries a criminal connotation.
The police arrested the pusher on the street corner.
pushy person; go-getter
Describes a person who is assertive or aggressive in pursuing goals; can be positive or negative depending on context.
He's quite a pusher at work.