¿CONONCES EL VERBO: "TO FAST"?
Most of the time when we think of the word "fast" we think of it as an adjective like: "a fast car" or "a fast runner". We can, however, also use it as a verb.
"To fast" means to stop eating for a period of time and is a common practice in some religions. This idea of "fasting" can also be found in more common words such as "breakfast" which essentially means that every morning you are stopping (breaking) your fasting period! Which, interestingly, is exactly the same way "desayuno" is constructed!
Hope that helps!
Soy el director de Daniel Smith + Partners. Tengo más de 10 años de experiencia enseñando inglés a españoles.