The orb's glow illuminated the night sky.
Meaning: The orb's light made the sky bright at night.
Choice of Words: Glow means to emit light, and illuminated means to light up or make something visible. Night is the time between sunset and sunrise, and sky is the upper part of the Earth's atmosphere. So, the sentence means that the orb emitted light that made the sky visible during the night.
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Related Expressions