smallest room in the house

Noun

euphemistic no-plural

(euphemistic) The bathroom; the room containing the toilet.

Japanese Meaning

家の中で最も小さい部屋、つまり便所（トイレ）を指す婉曲表現

Excuse me, I'm just going to the smallest room in the house for a moment.

すみません、ちょっとお手洗いに行ってきます。

Sense（1）

(euphemistic) The bathroom; the room containing the toilet.