プログレッシブ和英中辞典(第4版)の解説
べんつう【便通】
a bowel movement，《口》 a BM（▼bowel movementの頭文字）；(an) evacuation
便通はどうですか
Do you have regular bowel movements?
この薬は便通をつける
This medicine 「keeps the bowels active [quickens the action of the bowels].
３日間便通がない
I haven't had a 「bowel movement [BM] for three days.