a one-way mirror

disco ball, mirrorball

male-to-female crossdresser / trans woman

road safety mirror, traffic mirror, a convex mirror placed near an obstructed road or intersection to provide a wider view

an adult son residing with his parents; generally has not yet or can not come into family inheritance / a female servant working in a daimyō, ōoku, or other high-ranking house

room rent

at-home clothes

(Internet slang) dirty room

(offensive, Internet slang) Alternative form of 子供部屋おじさん

(offensive, Internet slang) a man whose age is greater than about thirty or forty who lives in one's child room and with one's parent(s).