Feathers fluff up.

Meaning: This means that birds can make their feathers look bigger and fuller.

Choice of Words: Feathers are the lightweight, flat structures that cover the body of a bird. Fluff means to make something soft and puffy by shaking or rubbing it. In this context, "Feathers fluff up" means that birds can make their feathers look larger and more impressive by fluffing them up.

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Related Expressions