Cat yawned widely and arched its back.
Meaning: This sentence describes a cat opening its mouth wide and stretching its back, which is a common behavior in cats to stretch and relax.
Choice of Words: Yawned is a word used to describe the wide opening of the mouth and the deep intake of breath. Arched means to curve or bend into a rounded shape. Widely is an adverb that means to a great extent or degree.
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