Answer:
Separate
Explanation:
Unite is an English word used to describe the act of a group of people, animals or things coming together as one or a single unit. Therefore, when these group of people, animals or things choose not to come together (unite) as one; we say that they are separated from one another i.e they are apart from the rest.
For example, if arsenal football club wants to win the league, its players will need to unite.
Hence, unite means the opposite of separate; Stay means the opposite of leave.
Unite : Separate :: Stay : Leave.
