noun
a noun is a word that refers to a person, place, thing, event, substance, or quality. In this case, 'mare's tails' is a noun referring to a type of cloud formation that resembles the tail of a horse.
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The sky was filled with mare's tails, indicating a change in the weather.
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I knew it was going to rain when I saw mare's tails in the sky.
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Those mare's tails in the sky mean we're in for some bad weather.
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The mare's tails in the sky danced gracefully like wisps of smoke.