⇒ 满满一杯酒,他一饮而尽。 (Mǎnmǎn yī bēi jiǔ, tā yī yǐn ér jìn.) The glass was full to overflowing, but he drank it down in one gulp.
⇒ 看到警察来了,围观的人们一哄而散。 (Kàndào jǐngchá lái le, wéiguān de rénmen yī hòng ér sàn.) On seeing the police arrive, the people who had gathered to watch scattered.