expression, ichidan verb
beat a hasty retreat; turn tail and run
Idiomatic expression meaning to flee quickly, often in a cowardly or undignified manner. Literally 'to hoist a sail on one's buttocks'.
警察が来るのを見て、泥棒は尻に帆かけて逃げた。
Seeing the police coming, the thief turned tail and ran.
彼は借金取りの顔を見るなり、尻に帆かけて逃げ出した。
As soon as he saw the debt collector, he beat a hasty retreat.