Zhǔrén yīzhí dǎhāqian, wǒmen zhǐhǎo shíqù de gàocí, miǎnde děng tā xià zhúkèlìng.
Our host kept yawning, so we took the hint and left rather than wait to be shown the door.
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Originally the decree by Qin Shi Huang expelling foreign advisers from the Qin court; Li Si's famous 《谏逐客书》 argued against it. The phrase later generalized to any host's signal that a guest should leave.
