answers the call of nature

Verb

answer the call of nature (third-person singular simple present answers the call of nature, present participle answering the call of nature, simple past and past participle answered the call of nature)

1. (euphemistic, idiomatic) To satisfy a bodily urge to urinate or defecate.
   • Che [Guevara] jumped from his seat and rushed from the room, pursued by the entire press corps. Down the hall he went, and into the men's room where, surrounded by reporters, he proceeded to answer the call of nature, shouting: "Liberdad!"1978 April 18, Charles Lynch, “Trudeau struts and frets”, in Ottawa Citizen, Canada, retrieved 03 Sep 2010, page 7