Wag tail.
Meaning: This means to move the tail back and forth quickly. It's like saying, The dog is moving its tail back and forth.
Choice of Words: Wag is a verb that means to move back and forth quickly. Tail is a noun that refers to the long, thin part of an animal's body that sticks out at the back. When a dog wags its tail, it is usually a sign that it is happy or excited.
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Related Expressions