The cat slept peacefully on the bed.
Meaning: The sentence describes a cat that was resting with its eyes closed in a calm and quiet manner on a piece of furniture used for sleeping.
Choice of Words: Slept is the past tense of the verb "to sleep", which means to rest with your eyes closed. Peacefully means in a calm and quiet manner. Bed is a piece of furniture used for sleeping on.
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Related Expressions