switch

The word “switch” means a device used to turn an electrical circuit on or off. In plain terms, to change from one thing to another, or a device (electrical, mechanical, or in networking) that controls or redirects something.

“Switch” is pronounced swihch (/swɪt͡ʃ/ in IPA).

Here is “switch” used in a sentence: “She flipped the light switch as she entered the room.”

Words with a similar meaning to “switch” include swap, commute, counterchange, exchange, replace and shift.

The opposite of “switch” — its antonyms — are abide, endure, last, remain and stay.

Depending on how it is used, “switch” can be a noun and a verb.

The word “switch” dates back to around 1800 and comes from Dutch. Possibly from Middle Dutch swijch, "twig" — the earliest meaning was a thin flexible rod, and the electrical/mechanical sense came much later, around 1800.

“Switch” is a fairly common word in modern English, usually learned at around the B1 level.

A switch usually stays in the position you leave it, holding a circuit on or off until you move it again — like a light switch on a wall. A button is typically momentary: it acts only while pressed and then springs back, such as a doorbell or a keyboard key.

Common electrical switches include toggle switches that flip up and down, rocker switches that press on one side, push-button switches, and rotary or dimmer switches that turn. There are also slide and touch-sensitive types. Each does the same basic job: opening or closing a circuit to control the flow of electricity.

A switch works by breaking or completing an electrical circuit. When it is 'on', its internal contacts touch and let current flow; when 'off', the contacts separate and open a gap that stops the current. Flicking the switch simply moves those contacts together or apart to control the power.