noun, noun or participle which takes 'suru'
relieving oneself; going to the toilet
A formal or clinical term for using the toilet, often used in medical, caregiving, or institutional contexts. Can be used as a noun or with する to mean 'to go to the toilet'.
入院中は、看護師に用便の介助をお願いした。
During my hospital stay, I asked the nurse for assistance with going to the toilet.
高齢者施設では、定期的に用便の時間を設けている。
At the elderly care facility, they set regular times for using the toilet.
noun, noun or participle which takes 'suru'
finishing one's business
A rare, euphemistic extension meaning 'to finish one's business' (i.e., to complete defecation/urination). Cross-referenced with 用弁, which is a homophonous variant. This sense is not commonly used in modern Japanese.
See also: 用弁
古い文献では、「用便を済ませる」という表現が見られる。
In old documents, the expression 'to finish one's business' can be found.