'slenderize' originates from the English word 'slender,' which comes from the Middle English 'slendre,' meaning 'thin or slight.'

'slendre' transformed into the modern English word 'slender,' and eventually led to the formation of 'slenderize' by adding the suffix '-ize.'

Initially, 'slender' meant 'thin or slight,' and this meaning has largely remained the same in modern usage, with 'slenderizing' referring to the act of making something appear slender.