Meaning of the word "put the knife in" in English

What does "put the knife in" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

put the knife in

US /pʊt ðə naɪf ɪn/
UK /pʊt ðə naɪf ɪn/
"put the knife in" picture

Idiom

to betray someone or cause them great emotional pain, especially by saying or doing something hurtful at a vulnerable moment

Example:
After all I've done for him, he really put the knife in by spreading those rumors.
Her cruel comment really put the knife in when I was already feeling down.