The Spanish word 'escalofrío' (meaning 'shiver' or 'chill') has an interesting formation that combines contrasting temperature concepts. It evolved from an earlier Spanish word 'calofrío', which was created by combining the Latin words 'calor' (meaning 'heat') and 'frigidus' (meaning 'cold'). The modern form 'escalofrío' was created by adding the Spanish prefix 'es-' to 'calofrío'.

This combination of 'heat' and 'cold' in one word makes intuitive sense when you think about the physical sensation of shivering or getting chills - it's often accompanied by alternating sensations of hot and cold, like when you have a fever.

A simpler and very common Spanish word that shares part of this etymology is 'calor' (meaning 'heat'), which comes directly from the Latin word 'calor'. You might hear this word frequently in phrases like 'hace calor' (it's hot) or 'tengo calor' (I'm hot). Another related word is 'frío' (meaning 'cold'), which comes from Latin 'frigidus'. These two opposite concepts came together to form 'escalofrío'.

While English 'cold' is not related to this word family, we do have several English words related to the 'calor' part, coming from the same Latin root. These include 'calorie' (a unit of heat energy), 'caloric' (relating to heat), and 'cauldron' (a large pot for heating). The word 'frigid' is directly related to the Latin 'frigidus' that gave us the '-frío' part of 'escalofrío'.