Synonyms of 'stab someone in the back'
▷ See stab
betrayDictionary, double-cross (informal) , sell out (informal)
She has been stabbed in the back by her supposed `friends'.
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He might be seen as having betrayed his mother.
If someone you trust double-crosses you, they do something which harms you instead of doing something they had promised to do.
They were frightened of being double-crossed.
Thesaurus for stab someone in the back from the Collins English Thesaurus
If you say that someone has stabbed you in the back , you mean that they have done something very harmful to you when you thought that you could trust them. You can refer to an action of this kind as a stab in the back .