answer the call of nature

answer the call of nature or obey the call of nature  {v. phr.},  {slang}
To go to the bathroom to relieve oneself by urinating or defecating.
Ted was hiking in the mountains when suddenly he had to answer the call of nature but since there was no bathroom in the woods, he excused himself and disappeared behind the bushes.
Categories: call slang verb
Source: A Dictionary of American Idioms

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