Rainbow arches in the sky.
Meaning: This sentence describes the rainbow forming a curved shape in the sky.
Choice of Words: Rainbow is an optical and meteorological phenomenon that causes a spectrum of light to appear in the sky. Arches means to form a curved shape. Sky is the region of the atmosphere and space seen from the earth. When you put them together, "Rainbow arches in the sky" describes the rainbow forming a curved shape in the sky.
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Related Expressions