behind sb's back
C2 If you do something behind someone's back, you do it without them knowing, in a way that is unfair:
I dread to think what they say about me behind my back.
Thesaurus: synonyms and related words
Secrecy and privacy
- anonymity
- anonymize
- anonymous
- backroom
- backstage
- counsel
- dissimulation
- entre nous
- executive privilege
- furtive
- gatepost
- lid
- lip
- privately
- privileged
- sanctum
- secrecy
- secret
- skeleton
- sweep
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