big sister


noun

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.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for big sister

  • 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
  • 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
  • "Well, you must come if you ever care to," she said, with a big-sister graciousness.

    Ramsey Milholland|Booth Tarkington
  • 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