The Spanish word 'trabajo' (meaning 'work') has a rather dark etymology that traces back to Latin. It comes from the Vulgar Latin verb 'tripaliare' meaning 'to torture', which itself was derived from 'tripalium' - a Roman torture instrument made of three stakes. The 'tripalium' got its name by combining two Latin elements: 'tri-' meaning 'three' and 'palus' meaning 'stake' or 'pole'.

Over time, the meaning evolved from the specific act of torture to the more general concept of suffering or torment, and eventually to the notion of laborious effort, finally settling on its modern meaning of 'work'. This semantic shift from torture to work reflects the historical view of labor as something difficult and painful.

The verb form 'trabajar' meaning 'to work' is directly related to 'trabajo'. Other common Spanish words in this family include 'trabajador' (worker), 'trabajoso' (laborious), and 'trabajado' (worked, elaborated).

While English 'work' is not related to 'trabajo', English borrowed the French word 'travail' (meaning difficult work or labor), which shares the same Latin origin as the Spanish 'trabajo'. This word appears in English phrases like 'labor and travail' and gives us words like 'travel', which originally referred to the laborious activity of making a journey.