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A northern promise that you’ll flash your backside in a fancy shop window if something doesn’t go your way. It’s like saying you’d rather be humiliated than be wrong.
I’ll bare my arse in Fenwicks’ window if this team doesn’t win the league.
She said she’d bare her arse in Fenwicks’ window if he didn’t propose by Christmas.
He bet his best mate he’d bare his arse in Fenwicks’ window if the cake didn’t rise.