switchswitchswitchesswitchedswitching2verb (switches, switching, switched)to change to something different: I switched to another seat because I couldn't see the film.switch something offto make a light or a machine stop working by pressing a switchsame meaningturn something off: I switched the TV off. Don't forget to switch off the lights!switch something onto make a light or a machine work by pressing a switchsame meaningturn something on: Switch the radio on.switchswitchswitches1noun (pluralswitches)a small thing that you press to turn electricity on or off: Where is the light switch?