Примеры употребления для on and off
1. Electricity flickers on and off quite frequently.
2. The Lights Going On And Off by Martin Creed An art installation set in a plain room in which the lights flash on and off every five seconds.
3. "The hurricane season is not an on and off switch.
4. Switching CFLs on and off frequently shortens their lives.
5. The affair continued on and off for several years.