to have an attack of diarrhoea―have loose bowels―(下剤をかけてなら)―purge the bowels―evacuate the bowels―open the bowels―loosen the bowels
to have a secret understanding with each other
a stomach
the condition of the stomach and the intestines
to have one's stomach full
having been disembowelled
腹が弛んだ
腹がたつさま