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sleeve
wing (of a stage, desk, gate, etc.)
flap (of a dust jacket)
彼は袖を通して新しい服を着てみた。
He slipped his arms through the sleeves and tried on the new clothes.
買ったシャツの袖が長すぎて困っている。
The sleeves are too long and it's troublesome.
今日は暑いので袖の短い服を選んだ。
I chose clothes with short sleeves.