Undressing
noun, verbal noun
If you undress from clothes you are undressing.
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.