get all tuckered out
To become very sleepy or fatigued, especially after long, continuous physical activity. Aw, the little guy got all tuckered out from our hike. I bet he'll sleep the whole way home. A: "I hope the kids got all tuckered out at the pool." B: "No, somehow, they're still full of energy!" My poor old dog got all tuckered out climbing up those steps.
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