Disconnect (verb)

1. Separate or break the connection of (something) from something else.
2. Cause (something) to stop being connected or joined to something else.
3. Cause (something) to stop working or functioning.
4. Terminate (a call, conversation, etc.) abruptly or unexpectedly.

Origin:

Late 17th century (in the sense "disunite"): from dis- (expressing reversal) + connect.

Examples:

1. He disconnected the phone from the wall.
2. She disconnected the computer from the internet.
3. The power was disconnected to the building.
4. He disconnected the call without saying goodbye.
5. The two parts were disconnected and couldn't be reconnected.