He turned on the light to see in the dark.
Meaning: This means that he moved a device around an axis to produce energy that allows us to perceive with our eyes in the absence of light.
Choice of Words: Turned means to move something around an axis. Light is a form of energy that allows us to see. See means to perceive with the eyes. Dark means the absence of light. The sentence describes someone illuminating a dark space.
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Related Expressions