(electricity) A device to halt the current flow, a cut-out or trip.

(computing) A method to increase the usable memory beyond what the processor normally supports by switching between different areas of memory at runtime.

(radio) A switch allows one to select which antenna to use with a transmitter, receiver, or transceiver

(video games) A control on some joysticks, used to manipulate the point of view.

(US, railways) A set of points.

A security measure used to switch off a device in an emergency.

(rail transport, US) A railroad switch, having a Y shape, in which one line splits into two lines that diverge at equal angles.

(slang) Bisexual.

present participle of switch-hit

(bridge) The action of changing the North direction during an event, typically for the last round of a Mitchell movement, so that the pairs who were North-South become East-West and vice versa. This allows a single winning pair to be determined.