expression, godan verb (-tsu)
go to the bathroom; go to the restroom; excuse oneself
A polite, indirect way to say one is going to the toilet, often used in social or formal settings.
会議中に、彼は「トイレに立ちます」と言って席を外した。
During the meeting, he excused himself, saying 'I'll go to the restroom.'
すみません、ちょっとトイレに立ってもいいですか。
Excuse me, may I go to the bathroom for a moment?