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English definition of “turn”

turn

verb [I or T, usually + adv/prep] (SWITCH)    /tɜːn/ US  /tɝːn/
A2 to use a control to switch a piece of equipment or a power or water supply on or off, or to increase or reduce what it is producing : Turn off/out the light . Who turned the telly on? I asked him to turn down the heating . Turn the sound up - I can't hear what they're saying. This sort of heater turns off (= can be switched off) at the mains .Electricity and electronics
(Definition of turn verb (SWITCH) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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