break one's fast

verb2

1. •
   To conclude any period of intentional fasting (usually for religious or medical reasons) by consuming food.
2. •
   (old-fashioned) To eat breakfast; to eat the first meal of the day after a night of not eating or to conclude any period of fasting by consuming food.

   • His servant placed before him a slice of toasted bread, with a glass of fair water, being the fare on which he usually broke his fast. — 1816