noun
a prickly plant with purple or pink flowers and typically sharp spines
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The thistle is a type of flowering plant known for its prickly leaves and purple flower head.
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Watch out for those thistles in the field, they can prick you if you're not careful.
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I ain't messin' with those thistles, they're like nature's little porcupines.
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The thistle in this situation represents the obstacles we must overcome in order to succeed.