スイッチ

すいっち
noun
switch
electronics
1. switch
A device for making or breaking an electrical connection, typically to turn something on or off.
Please turn on the switch.
スイッチを入れる = to turn on
I forgot to turn off the light switch.
スイッチを切る = to turn off
A sound comes out when you press the switch.
When you leave the room, please be sure to turn off the air conditioner switch.
The wall switch is old and has a poor connection, so the light won't turn on unless you press it several times.
2. switch, change
A change or shift from one thing to another.
Something switched on inside me.
Figurative use: getting motivated
I switched over to work mode.
スイッチを切り替える = to switch over
When I drink coffee in the morning, my brain switches on.
I listen to music before the match to switch on my focus.
When going from a day off back to a weekday, I have trouble switching my mindset and it's a problem.
スイッチが切り替わる = the switch flips (intransitive)

From English "switch." Used both literally (electrical device) and figuratively (mental shift).

Common patterns

Usage

The transitive ()れる (someone turns it on) vs. intransitive (はい) (it turns on) distinction is important: スイッチ()れる vs. スイッチ(はい).