pusherboat
nounUK /ˈpʊʃə bəʊt/
US /ˈpʊʃər boʊt/
A pusherboat is a strong boat that pushes other boats or barges from behind.
The pusherboat nudged the long line of barges down the river.
OTHER MEANINGS
2. A small motorized vessel used to maneuver larger ships in a harbor.
A pusherboat guided the freighter into its dock.
3. A boat designed to push floating logs or rafts in logging operations.
The pusherboat moved the log raft toward the mill.
4. Informal: a person who pushes or promotes something aggressively.
He was the pusherboat behind the new neighborhood project.