stab 
(stăb)
(stăb)v. stabbed, stab·bing, stabs
v.tr.
1. To pierce or wound with or as if with a pointed weapon.
2. To plunge (a pointed weapon or instrument) into something.
3. To make a thrusting or poking motion at or into: stabbed the air with his fingers.
v.intr.
1. To thrust with or as if with a pointed weapon: stabbed at the food with her fork.
2. To inflict a wound with or as if with a pointed weapon.
n.
Idiom: 1. A thrust with a pointed weapon or instrument.
2. A wound inflicted with or as if with a pointed weapon.
3. A sudden piercing pain.
4. An attempt; a try: made a stab at the answer.
stab (someone) in the back
To harm (someone) by treachery or betrayal of trust.
[Middle English stabben.]
stabber n.