Definition of big sister
1
: an older sister
2
: a woman who serves as a companion, mother figure, and role model for a girl
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“Big sister.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/big%20sister. Accessed 20 Jan. 2022.
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Time Traveler for big sister
The first known use of big sister was in 1828
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