The Spanish word 'travieso' (meaning 'mischievous') comes from the Latin word 'transversus' meaning 'oblique' or 'transverse'. This Latin word was formed by combining two elements: the prefix 'trans-' meaning 'across' and 'versus' meaning 'turned'. The semantic evolution from 'turned across' to 'mischievous' likely developed from the idea of something or someone going off the straight path or proper direction, metaphorically coming to refer to someone who doesn't follow the rules or behaves improperly.

Some related Spanish words include 'través' (through), 'atravesar' (to cross), and 'transversal' (transverse). All these words share the same Latin root 'transversus' and maintain connections to the original meaning of 'crossing' or 'going across'. While these words kept their literal spatial meanings, 'travieso' developed a more figurative sense to describe behavior that 'crosses' proper boundaries.

English speakers might recognize the connection to words like 'traverse' (to cross), 'transverse' (lying across), and 'versus' (against). These words all trace back to the same Latin elements. While the English words maintained meanings more closely related to physical crossing or opposition, the Spanish 'travieso' evolved to describe behavioral crossing of boundaries.