打更 dǎgēng
[sound the night watches;patrol the streets at night and announce the watches] 旧时打梆子或敲锣巡夜报时(一夜分为五更,每更约两小时)
旧时把一夜分做五更,每到一更,巡夜者敲锣击梆以报时,称为「打更」。
如:「北方有些城市仍然保有打更的传统,从晚上八时起至隔日清晨四时止。」
英语 to sound the night watches (on clappers or gongs, in former times)