It can also be a mechanical interlock device that will not let the ignition switch turn to start if the car is in the gear.

同样，安全开关也可以是机械互锁装置，当汽车挂挡后不允许点火开关转到启动位置。

youdao

Which switch do I press to turn it off?

我按哪个开关就能把它关了？

《牛津词典》

You don't need a light switch or a light bulb or an iPhone app to turn something on or off.

你不需要电灯开关、灯泡或苹果手机应用程序来打开或关闭某些东西。

youdao

Of course, to turn the on-off switch on is harder when somebody's in a coma.

当然要开启这个开关难度更大,当人陷入昏迷。

耶鲁公开课 - 死亡课程节选

And so we can't turn the switch on in the normal way.

让我们不能像平时一样正常开关。

耶鲁公开课 - 死亡课程节选

Yeah. So, just that little turn of a switch there.

没错,所以,只需那么一点点转换

耶鲁公开课 - 聆听音乐课程节选

With no hard drive, and a switch to turn off the wireless connection (not the fastest in the world), power can be conserved.

ECONOMIST: Rational consumer

"We're not that good yet to be able to turn that switch on and off, " C.

WSJ: Knicks rally without Melo, beat Cavaliers 102-97

"You...start almost immediately to turn the switch on from a shorter-term tactical focus to a longer-term strategic focus, " he says.

WSJ: Elite Advanced Management Programs - Nondegree Courses for Experienced Executives - WSJ.com