Definition of "puff up" []

• To inflate with air. (verb)
• To swell due to injury or illness. (verb)
• To become proud. (Often written as puffed up with pride.) (verb)

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• "Train-Shaped Expandable Sponges: biodegradable (flushable) sponges that puff up to look like trains when they’re wet (see Resources)"
• "As they walked along one pyramid, an asura krewe swarmed the slanted side, hauling a huge dandelion puff up the incline."