stab1 past tense and past participle stabbed, present participle stabbing
to push a knife into someone or something [↪ stabbing]:
He was stabbed to death in a fight.
stab somebody in the heart/arm etc
She had been stabbed in the chest repeatedly.
2 [intransitive and transitive]
to make quick pushing movements with your finger or something pointed [= jab]:
He raised his voice and stabbed the air with his pen.
to do something that harms someone who likes and trusts you [= betray]