'plump-lipped' originates from the English word 'plump,' which means 'full and rounded,' combined with 'lipped,' referring to the lips.

'plump' changed from the Middle English word 'plumpe,' meaning 'full or rounded,' and 'lipped' from the Old English 'lippa,' meaning 'lip.'

Initially, 'plump' meant 'full or rounded,' and this meaning has largely remained the same in modern usage.