'buttock' originates from Old English, specifically the word 'butuc,' where 'butt' meant 'end' or 'bottom.'

'butuc' transformed into the Middle English word 'buttok,' and eventually became the modern English word 'buttock.'

Initially, it meant 'end or bottom part,' but over time it evolved into its current meaning of 'the fleshy part of the body at the back of the hip.'