The term 'follow behind' can be expressed in two words: 'TRAIL' and 'TAGALONG'. The word 'TRAIL' is a noun that means a mark or path left by someone or something that has gone before. It can also refer to a route or track used for a particular purpose, such as a hiking TRAIL. The word 'TAGALONG' is a verb that means to accompany someone or something, usually without being invited. It can also mean to persistently follow someone or something. Therefore, the phrase 'follow behind' can be interpreted as leaving a mark or path, or accompanying someone or something without being invited.