Undressing
noun, verbal noun
If you undress from clothes you are undressing.
脱衣 is a relatively formal word that you'll mostly see on the signage for changing rooms at public baths, where they'll be called 脱衣所 or 脱衣場.
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.
脱衣をしてから入浴してください。
Please undress before taking a bath.
脱衣所にアップルウォッチを忘れてしまいました。
I forgot my Apple Watch in the changing room.
車イスで母を風呂場のドアの前まで運び、脱衣を手伝いました。
I used a wheelchair to take my mother to the bathroom door, then helped her undress.
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