鶏の空音

Etymology
Based on 's incident at from the.

As Mengchang and his retainers escape king Zhao's men late at night, they reached the pass. Qin law states that guests are allowed to exit the pass only by the cries of the cock in the morning. One of Mengchang's retainers were able to imitate the cry, and did as such. This resulted in cocks around him starting to cry after one another, confusing the guards and making them open the gates. Mengchang (with fake credentials) and his retainers passed through safely.

Noun

 * 1) the imitative cry of a cock