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(one's) older brother
young man; sonny; lad
兄ちゃんが帰ってきた。
My older brother is back.
兄ちゃん、この宿題教えてよ。
Big brother, help me with this homework.
昔から兄ちゃんは近所の子供たちに慕われていた。
Since long ago, my big brother has been looked up to by the neighborhood kids.