The Spanish word 'cojo', meaning 'lame' or 'limping', traces back to the Vulgar Latin word 'coxus' with the same meaning. 'Coxus' itself developed from the Classical Latin word 'coxa', which meant 'hip'. The semantic evolution from 'hip' to 'limping' makes intuitive sense, as hip problems often cause limping or lameness.

While 'cojo' itself is a relatively simple and common Spanish word, it has given rise to related words like 'cojear' (to limp) and 'cojera' (lameness).

The Latin root 'coxa' meaning 'hip' has made its way into English medical terminology. You might recognize it in words like 'coxal' (relating to the hip) and 'coccyx' (tailbone, from the same anatomical region). While these aren't everyday English words, understanding this connection can help remember that 'cojo' relates to a physical condition affecting movement.