The lightning illuminated the dark sky momentarily.
Meaning: This sentence is describing how the lightning made the sky light up for a short time.
Choice of Words: Lightning is a bright flash of light in the sky caused by electricity. Illuminated means to make something light up. Momentarily means for a very short time. Dark means having little or no light. When you put them together, "The lightning illuminated the dark sky momentarily" is a vivid description of how lightning can briefly light up the night sky.
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Related Expressions