younger sisters
definitions
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female siblings who are younger in age than the person or group being referred to.ja: 年下の妹たち
examples
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Elizabeth and Jane spent their days reading and walking together, and their younger sisters seemed to be on their best behaviour.
エリザベスとジェーンは読書や散歩をして一日を過ごしており、妹たちはとても行儀よくしているようだった。