How to Say "to backstab" in Spanish
The Spanish word for “to backstab” is “apuñalar” — C1 level.
English → SpanishC1
verbC1informal
betraying someone's trust

Examples
No puedo creer que me fueras a apuñalar así después de toda mi ayuda.
I can't believe you were going to backstab me like that after all my help.
Metaphorical Use
Just like in English, this word is used to describe emotional pain or betrayal by someone close.
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