Where did the slang word grub for food come from?

The slang Word "grub" for food likely originated from the Middle English Word "grube," meaning to dig or search for food. This evolved into the Word "grubben" in Old English, which referred to digging up food such as roots or mushrooms. Over time, "grub" came to be used colloquially to refer to any type of food, especially simple or basic fare.