to break the connection of (something), e.g. to a power supply
Disconnect the lawnmower before cleaning the blades
to cut off the supply of (a public service, e.g. electricity or the telephone)
to cut off the supply of e.g. electricity or the telephone to (a person, etc)
to cut (somebody) off during a telephone call
to become disconnected or be able to be disconnected
disconnection /-ʹneksh(ə)n/ noun