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sleeve
wing (of a stage, desk, gate, etc.)
flap (of a dust jacket)
シャツのそでが少し長すぎる。
The shirt sleeves are a bit too long.
そでにコーヒーのしみがついた。
I got a coffee stain on my sleeve.
子供がお母さんのそでを引っ張る。
The child tugs at their mother's sleeve.