a call of nature
idiomPart ofcall
a call of nature — idiom
1. a polite or humorous way of referring to the need to use a toilet
1.idiom
Definition
a polite or humorous way of referring to the need to use a toilet
Example
Christopher excused himself from the dinner table, saying he had to answer a call of nature.
The long bus ride had no rest stops, so passengers had to wait until the driver answered a call of nature.