Definitions
1.NounOne who thrusts, who pushes or stabs.
2.NounA device for propelling an object, especially a spacecraft or a ship (marine vessel).
3.NounA bow thruster or a stern thruster.
4.NounA 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.
5.NounAn ambitious, driven person; a go-getter.