You probably know the word 'back'. But did you know that it can be used as a noun, verb, adjective, adverb, and a phrasal verb? In this lesson, you'll learn to use this very common word in each of these ways. The English language has many words that can have different meanings. You will learn how this simple word can take on many different meanings, and will be given examples to help you understand each of them. You'll also learn expressions with the word 'back'. So don't hold back, and don't back out. Check out this video!