'slim-built' originates from the English words 'slim' and 'built', where 'slim' means 'thin' and 'built' refers to 'physique'.

'slim' and 'built' have been used in English since the late Middle Ages, with 'slim' coming from Middle Low German 'slim' meaning 'slender'.

Initially, 'slim' meant 'slender or thin', and 'built' referred to 'constructed'. Together, they evolved to describe a slender physique.