Wag
Definition 1 of 4
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Positive Emotion
Wagging often shows a dog's happiness or friendly attitude. Seeing its owner, the puppy wagged its tail joyously.
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Not Only Tails
While tail-wagging is common, 'wag' can describe other quick side-to-side movements. She wagged her finger at her class to grab their attention.
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Metaphorical Use
Sometimes 'wag' is used figuratively to suggest movement like a wagging tail. The comedian had the audience wagging with laughter.