to remove a piece of equipment from a supply of gas, water or electricity

to officially stop the supply of phone lines, water, electricity or gas to a building

You may be disconnected if you do not pay the bill.

The ski had become disconnected from the boot.

to break the contact between two people who are talking on the phone

I keep getting disconnected when I'm online.

My computer crashes every time I disconnect from the internet.

to remove somebody's connection to a piece of equipment, especially a life support machine

It was the family's decision to disconnect her from the life support machine.

a lack of connection with a network, a supply of electricity, the internet, etc.

There might be a power failure or sudden network disconnect.

LEARNit Dictionary