an act of stabbing or trying to stab someone with a knife:
severe stab wounds
a stab victim
He killed him with a stab to the heart.
a sudden sharp feeling of pain or a strong emotion:
He felt a stab of guilt.
an attempt to do something, often not successfully
have/make/take a stab at (doing) something
I'll have one more stab at it.
when someone you thought was a friend tries to harm you