The Spanish verb 'alcanzar' (meaning 'to reach' or 'to catch up with') has an interesting etymology that combines Latin and Arabic influences. It comes from Old Spanish 'acalçar', which developed from the Vulgar Latin word 'incalciare' meaning 'to follow at the heels'. The Latin root goes even further back to 'calx' meaning 'heel'. The current form 'alcanzar' shows Arabic influence through the addition of the Arabic definite article prefix 'al-', which was a common modification of words during the Moorish period in Spain.

The semantic development from 'heel' to 'reach/catch up' makes intuitive sense - if you're following at someone's heels, you're close to reaching or catching up to them. This concrete physical meaning expanded to include more general senses of reaching or attaining something.

A related Spanish word is 'calzar' (to put on shoes/footwear), which comes from the same Latin root 'calx' (heel). While 'alcanzar' developed to mean reaching or catching up to something, 'calzar' maintained its connection to feet and footwear. Another related word is 'calzado' (footwear), which is commonly used in modern Spanish.

While there aren't many common English words directly related to 'alcanzar', we do have some technical terms that share the Latin root 'calx'. For example, 'calcaneus' (the heel bone) and 'calcaneal' (relating to the heel) are used in medical terminology. These words maintained the original anatomical meaning of the Latin 'calx' (heel), while the Spanish 'alcanzar' developed a more metaphorical meaning of reaching or catching up.