Feather is a lightweight, plumed covering of a bird, often used metaphorically to describe softness or lightness. In everyday English, it denotes the fluffy exterior of birds, and appears in expressions like 'feather in one's cap' or 'light as a feather.' The noun can also refer to a decorative ornament or a financial unit in some contexts. 2-4 sentences summarize its physical feature and figurative uses in clear terms.
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