
Put/stick the knife in
Emotional Charge
Used when feelings are involved; it suggests betrayal has an emotional impact.

She put the knife in by mocking my dreams in front of our friends.
Friendship's End
Often used when a friend acts disloyally, terminating the trust in a relationship.

He really stuck the knife in when he cheated with my girlfriend.
Unexpected Hurt
Implies that the hurtful act was surprising and not anticipated.

I never expected her to put the knife in by revealing my secrets.
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