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?

• the lions' den
• the lion's share
• the long and the short of it
• the long arm of the law
• the love of life
• the love of your life
• the lowest common denominator
• the lowest of the low
• the low man on the totem pole
• the luck of the draw
• the lull before the storm
• the main drag
• them and us
• the man in the street
• the man of dreams
• the man of the moment
• the man of your dreams
• the man on the Clapham omnibus
• the man on the street
• the matter in hand
• the meat and potatoes
• the men in grey suits
• the men in white coats
• the Midas touch
• the middle ground