› a complete change of one thing for another: a switch from/to sth The switch to a flat rate of tax could boost spending. Banks are encouraging customers to make the switch from paper to electronic statements.
› COMMUNICATIONS, IT a piece of equipment in a network that receives electronic data and sends it to the right place
› a small part or object that you move or press to make a light come on, make a machine start working, etc.: press/flick the switch → See also bait-and-switch