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English definition of “turn”

turn

verb [always + adv/prep] (SWITCH)   /tɜrn/
to use a control to switch a piece of equipment on or off, or to adjust it to change the amount of what it is producing: [M] Please turn off/out the lights when you leave. [M] Who turned my computer on/off? [M] Turn the TV down (= make the sound quieter) – it’s too loud. [M] Turn up the volume – I can’t hear what they’re saying.
(Definition of turn verb (SWITCH) from the Cambridge Academic Content Dictionary © Cambridge University Press)
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