The Spanish verb 'holgar' (meaning 'to rest' or 'to be idle') has an interesting journey from Latin roots. It comes from the Late Latin word 'follicare' meaning 'to breathe or pant', which itself derived from the Latin word 'follis' meaning 'bellows' or 'leather bag'. The semantic evolution from a bellows or bag to breathing (like the motion of a bellows) and finally to resting or being idle makes intuitive sense - when we rest, we can breathe easily and freely, unlike when we're working hard and panting.

A common related Spanish word is 'huelga' (meaning 'strike' as in a worker's strike), which comes from the same root. Just as 'holgar' means to rest or be idle, a 'huelga' is when workers collectively decide to rest or be idle as a form of protest. Another related word is 'holgado' (meaning 'loose, spacious, or comfortable'), which captures the sense of having breathing room or space to relax.

While there aren't any common English words directly related to 'holgar', the Latin root 'follis' did give us some English words. The word 'fool' actually comes from this same Latin root 'follis', as it originally referred to someone full of air or wind, like a bellows - essentially an airhead! Another related word is 'follicle', which originally meant a small bag or sac, preserving the original meaning of the Latin 'follis'.