noun
A substance that promotes bowel movements; a medical or folk remedy for constipation.
このハーブは腹下しとして使われてきた。
This herb has been used as a laxative.
noun, noun or participle which takes 'suru', intransitive verb
Refers to the condition of having loose or watery stools; can also be used as a suru-verb to mean 'to have diarrhea'.
昨日から腹下しが止まらない。
I've had diarrhea since yesterday.
冷たいものを飲みすぎて腹下しした。
I drank too much cold stuff and got diarrhea.