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big sister

an elder sister.
(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.
(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. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2016.
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Examples from the Web for big-sister
Historical Examples
  • "Well, you must come if you ever care to," she said, with a big-sister graciousness.

    Ramsey Milholland Booth Tarkington
  • Libby smiled in an amused, big-sister sort of way, asking how Will'm supposed anybody could read his letters.

    Miss Santa Claus of the Pullman Annie Fellows Johnston
  • She was shy of the big-sister manner; Vida would either laugh at her or snatch the idea and change it to suit herself.

    Main Street Sinclair Lewis
  • As she looked at the young and slender girl before her, a big-sister feeling came sweeping over her.

    The Crystal Ball Roy J. Snell

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