The Spanish verb 'aburrir' (meaning 'to bore') comes from the Latin word 'abhorrere', which meant 'to shrink from' or 'to reject'. This Latin word was formed by combining two parts: the prefix 'ab-' meaning 'away from', and the verb 'horrere' meaning 'to tremble' or 'bristle'. Over time, the meaning evolved from physically shrinking away from something unpleasant to the modern sense of being mentally disengaged or bored with something.

A related Spanish word is 'horrible', which more directly preserves the sense of the Latin 'horrere'. When something is 'horrible', it makes you want to shrink away from it, maintaining a connection to the original Latin meaning.

The English word 'abhor' is a direct relative of 'aburrir', as both come from Latin 'abhorrere'. While 'aburrir' developed to mean 'to bore', 'abhor' retained more of the original Latin meaning of 'to reject strongly' or 'to detest'. The English word 'horror' is also related, coming from the Latin 'horrere', and maintains the sense of something that makes one tremble or recoil.