'slim-toed' originates in Modern English as a compound of 'slim' (meaning 'thin') and 'toe' (meaning 'toe'), with the adjectival suffix '-ed' forming the adjective 'slim-toed'.

'slim' is attested in Middle English as 'slim' meaning 'thin'; 'toe' derives from Old English 'tā' and developed into Middle English 'toe'. These elements combined in modern English to form the descriptive compound 'slim-toed'.

Initially, the compound simply meant 'having slim toes'; over time the meaning has remained essentially the same, used descriptively for people, animals, or footwear.