younger sisters' silliness
definitions
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The playful, lighthearted, or foolish behavior exhibited by sisters who are younger in age.ko: 어린 여동생들의 장난스러움
examples
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I had to endure my younger sisters' silliness all afternoon.
오후 내내 어린 여동생들의 장난스러움을 견뎌야 했다.