Next in line is a phrase used to indicate who is following or waiting after someone else. There are a few synonyms that can be used to convey the same meaning, such as "upcoming," "following," "subsequent," "successive," and "sequential." "Upcoming" is the most commonly used synonym and is often used to describe events or occasions that are about to happen. "Following" is used to indicate someone who comes directly after another person, while "subsequent" is used to show a chronological order. "Successive" is used to show a series of events or tasks that occur one after the other, and "sequential" is used to describe a logical sequence or order.