- the part of the body that you sit on synonym behind, bottom
- Get up off your backside and do some work!
Idioms
See backside in the Oxford Advanced American Dictionarya pain in the backside/arse (British English also)
(North American English also a pain in the ass/butt)
(also a pain in the neck)
- (informal) a person or thing that is very annoying
- That man's a pain in the backside!
Check pronunciation:
backside