preposition
a word governing, and usually preceding, a noun or pronoun and expressing a relation to another word or element in the clause
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After her successful surgery, the doctor confirmed that she was in the pink of health.
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I just got my test results back and I'm in the pink, everything's good!
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She's feeling in the pink after acing her exams.
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Despite the challenges, he remained in the pink and kept a positive attitude.