backside

be a pain in the arse/backside (British & Australian, very informal, American & Australian, very informal)

to be very annoying. I can't stand my brother-in-law. He's a real pain in the arse. Getting up for work at 5 a.m. is a pain in the ass.

See also: arse, pain

get off your backside (British & Australian, very informal!)

to stop being lazy and start doing something. It's time the government got off its backside and did something about improving the railways.

a kick up the arse/backside (British & Australian, very informal)

if you give someone a kick up the backside, you do or say something to try to stop them being lazy. He does nothing but watch TV all day. His mother should give him a kick up the backside. The threat of losing my job was the kick in the pants I needed.

See also: arse, kick

sit (around) on your backside (British & Australian, very informal!)

to do nothing, especially when other people are busy or need your help. How do people expect things to change if they just sit on their backsides and don't bother to vote?

See also: sit

think the sun shines out (of) someone's arse/backside (British & Australian, very informal)

to love or admire someone so much that you do not think they have any faults. You're never going to hear Maggie criticizing Jim - she thinks the sun shines out his backside!

See also: arse, shine, sun, think

work your arse/backside off (British & Australian, very informal, American, very informal)

to work very hard. My father worked his backside off to pay for our education.

See also: arse, work