I'll heat up a slice of yesterday's pizza.

heat Noun

— Heat is a kind of energy. It is the quality things have when they are warm or hot. This is a good coat. It keeps the heat in. The heat from the sun is making me feel hot and tired.

heat Verb

— To make something hot. I just need to heat up the food and then we can eat.

up Preposition

— Toward the top or toward the sky. The balloon went up.

up Adjective

— In a high position. The flag is up. — . It was an up day. — optimistic. He is feeling up. — Put in trust, entrusted. It is up to you. — ing, occurring. What’s up? They act like something is up. — . Something is up with him. — Planning, plotting mischief. He is up to something. — ed. It is all up with them.

up Noun

— State of being up, often with down. Life has its ups and downs.

up Verb

— Increase, increment. We upped the dosage.

a Determinative

— A is used when the following word could be any of a certain type. Compare "A book I saw on the shelf" and "The book I gave you yesterday".

a Noun

— A is the first letter of the alphabet. The letter "a" comes before "b". — In some schools, an A is a very high grade. Ron got an A on his earth science test.

slice Verb

— An act of cutting meat using a small knife. I sliced the fish and placed it into another bowl.

of Preposition

— Made using. It is a house of cards.

pizza Noun

— A pizza is a baked Italian food made of rolled bread dough crust, generally topped with tomato sauce, cheese and other ingredients.