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3. a kick up the arse

a kick up the arse

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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, up