The Spanish verb 'apretar' (meaning 'to press' or 'to tighten') comes from the Latin word 'appectorare', which meant 'to press to one's chest'. The Latin word was formed by combining three elements: the prefix 'ad-' (meaning 'toward'), the noun 'pectus' (meaning 'chest'), and the verbal suffix '-are'. Over time, as Latin evolved into Spanish, 'appectorare' first became the archaic Spanish form 'apetrar', which then evolved into the modern 'apretar'. The meaning broadened from specifically pressing something to one's chest to pressing or tightening in general.

A related Spanish word is 'pecho' (meaning 'chest'), which comes from the same Latin root 'pectus'. While 'apretar' developed from the action of pressing something against the chest, 'pecho' retained the original anatomical meaning.

The English word 'pectoral' (relating to the chest) is a cousin of 'apretar', as it also derives from Latin 'pectus'. While 'apretar' evolved to describe the action of pressing, 'pectoral' maintained its anatomical connection, referring to chest muscles or chest-related items. The English word 'expect' also has a connection, as it literally meant 'to look out from the chest' in Latin, though its meaning has significantly changed over time.