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transitive verb, ichidan verb
Because the hiragana ends with an う sound, you know this word is a verb. The kanji itself means dye so the verb vocab version is to dye.
You need to dye something that you just sewed (そ) together. It's all sewed and looks like a shirt, but it's colorless. That's where the dying comes in.
I’m wondering what color to dye my hair.