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big sister

noun
1.
an elder sister.
2.
(sometimes initial capital letters) a woman who individually or as a member of an organized group undertakes to sponsor or assist a girl in need of help or guidance.
3.
(sometimes initial capital letters) a young woman in the junior or senior class in college who advises a young woman in the freshman class on studies, social activities, etc., often as a part of a sorority program.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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