To thrust is to push forward quickly and forcibly, like the way a pirate would plunge or thrust a sword into his enemy.
Thrust is often used when you're talking about knives or swords or jabbing someone with something. In fact, a thrust refers to a sharp blow or stab. Violence aside, thrust can be any kind of forceful push or driving force. Aggressive street vendors thrust their wares on you and young movie stars are thrust into the limelight at an early age — which may be disconcerting, but certainly is not as frightening a knife thrust in your direction.