Turn off lights.
Meaning: This means to move a light switch from an on position to an off position. It's like saying, Make sure the lights are not operating or functioning.
Choice of Words: Turn is a verb that means to move something from an on position to an off position. Off is an adverb that means not operating or functioning. Lights is a noun that refers to things that produce light, such as lamps or bulbs.
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Related Expressions