noun

• One who thrusts, who pushes or stabs.
• A device for propelling an object, especially a spacecraft or a ship (marine vessel).
• (nautical) A bow thruster or a stern thruster.
• (surfing) A surfboard (usually a shortboard) with three fins of approximately equal size, one centred at the back, one on each side about 25cm forward and out near the rails.
• An ambitious, driven person; a go-getter.