noun
a light bulb is also used as a metaphor for an idea or inspiration
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The inventor Thomas Edison is credited with creating the first commercially practical incandescent light bulb.
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I need to change the light bulb in the hallway, it's been flickering for days.
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I had a light bulb moment and finally figured out how to solve the puzzle.
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The realization hit me like a light bulb turning on in a dark room.