The dog wagged its tail eagerly as it saw its owner.

Meaning: The dog showed its happiness and excitement by moving its tail quickly when it saw the person who owns it.

Choice of Words: Wagged means to move the tail back and forth quickly, often as a sign of happiness or excitement. Eagerly describes a feeling of strong desire or enthusiasm. Saw means to perceive something with the eyes. Owner refers to the person who has the right to possess or use something.

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Related Expressions