Meaning: If you do something behind someone's back, you do it without telling them.
- Category: Body and bodily functions
Idioms similar to 'Behind someone's back'
- On my back
- Put or get someone's back up
- Make a rod for your own back
- Watch your back
- Fed up to the back teeth
- Back foot
- Like the back of your hand
- Back-handed compliment
- Talk out of the back of your head
- You scratch my back and I'll scratch yours
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