a call of nature
成語所屬單字call
a call of nature — 慣用語
1. a polite or humorous way of referring to the need to use a toilet
1.慣用語
釋義
上廁所（委婉說法）
a polite or humorous way of referring to the need to use a toilet
例句
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.