Learner's definition of DISCONNECT
to separate (something) from something else
to break a connection between two or more things
— often + from
to stop or end the supply of electricity, water, gas, etc., to (something, such as a piece of electronic equipment)
to stop or end the supply of (electricity, water, gas, etc.)
Before starting, be sure to disconnect the power supply.
Our landlord threatened to disconnect our electricity.
to end the connection to a system, network, etc., through a telephone, computer, or other device