Disconnect means to stop being connected or related to something, and also can mean to lose contact with someone or something.
You've probably experienced it before - suddenly you lose signal on your phone or internet connection. That's a common use of "disconnect." But "disconnect" can also be used in more abstract ways, like when you're feeling disconnected from your friends after moving to a new place. In that case, you might feel like you're not part of the same group anymore.
To sever or interrupt a connection.
