switch on

Collins Concise English Dictionary © HarperCollins Publishers::

switch on verb (adverb)

1. to cause (a device) to operate by or as if by moving a switch, knob, or lever; turn on
2. (transitive) to produce (charm, tears, etc) suddenly or automatically
3. (transitive) (now slightly dated) to make up-to-date, esp regarding outlook, dress, etc

WordReference Random House Unabridged Dictionary of American English © 2026

switch-on  (swich′on′, -ôn′), n. 

1. Electricity the act or process of switching on an ignition, light, appliance, etc.

• noun, nominal use of verb, verbal phrase switch on