Light turned on.
Meaning: This means that the natural agent that makes things visible moved around an axis or pivot and started functioning. It's like saying, The illumination started working.
Choice of Words: Light is a noun that refers to the natural agent that makes things visible. Turned is the past tense of the verb 'turn', which means to cause to move around an axis or pivot. On is an adverb that means in operation or functioning.
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Related Expressions