The term 'Trails Behind' can be summarized as 'Lags', which is a four-letter word. Lagging is an action that occurs when something trails behind or falls behind in progress, speed, or development. It is often used to describe the behavior of a person or object that is not keeping up with the rest of the group. For example, if someone is walking with a group of people and they are lagging behind, it means they are not keeping up with the pace of the group.