Sandwich/ˈsænwɪtʃ/ Definition 1 of 5Pro Tip 1/3Cultural staple The sandwich is a common food in many cultures, often eaten for lunch or a quick meal. Sandwiches are popular at picnics. Pro Tip 2/3Variety of fillings A sandwich can have a wide range of fillings, not limited to the examples given. She loves peanut butter and jelly sandwiches. Pro Tip 3/3Open-faced variant Open-faced sandwiches have toppings on one slice of bread without a top slice. He ordered an open-faced roast beef sandwich.