Each week we answer questions about American English from readers from outside the United States.
But today we answer a question from the American state of Alabama. Khan writes: Could you tell me what else I can use instead of "heads up"? That term is considered informal; therefore, I would like to know the formal word for "heads up." Thanks. --Khan, Alabama Dear Khan,Thank you for writing. Let us look closely at this expression and other ways to say it. As you said, the term "heads up" is informal. However, it is so common in American English that we use it in almost every situation. "Heads up" can be used as a noun. It sends a message that says something is going to happen.