出恭

From an anti-cheating strategy in the Imperial Examination in ancient China, where candidates were required to hold a card written with the phrase 出恭入敬 (chūgōngrùjìng, “leaving and entering [the examination site] respectfully”) when going to toilet during the examination and return it when they were back so as to prevent them from leaving using such excuse (see 出 (chū), 入 (rù), and 恭敬 (gōngjìng) for detailed meaning).

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出恭

1. (euphemistic) to go to the toilet, especially to defecate

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