Wag tail
Meaning: This means to move the tail quickly back and forth. It's like saying, The dog is expressing happiness through the movement of its tail.
Choice of Words: Wag is a verb that means to move quickly back and forth. Tail refers to the long, thin part of an animal's body that hangs down from its back. Here, "wag tail" means to move the tail quickly back and forth.
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Related Expressions