Hash/hæʃ/ Definition 1 of 6Pro Tip 1/2Breakfast item Hash in a culinary context often refers to a hearty breakfast dish. The diner's best seller is their homemade beef hash. Pro Tip 2/2Reheated food Hash typically involves repurposing leftovers by dicing and reheating with other ingredients. Let's make a hash with the leftover roast and potatoes.