big sister

American  

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.

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Example Sentences

See Examples For:

big sister

"I had a lovely birth with her, a water birth. She was nearly two weeks overdue like her big sister but everything was fine and she was born perfectly healthy," she said.

From BBC ● Oct. 19, 2026

The pregnancy had been far enough along to start getting their 4-year-old daughter excited about decorating a nursery, family-of-four camping trips and what it would mean to become a big sister.

From Salon ● May 27, 2026

She has done so without being hounded by her big sister.

From Los Angeles Times ● Mar. 23, 2026

What she found was that the relationship went beyond business; she sees her agent as part negotiator, part therapist, part big sister.

From The Wall Street Journal ● Mar. 4, 2026

So the Berry jokes were over, and she instantly fell into big sister zone.

From "All American Boys" by Jason Reynolds

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