DICT.TW Dictionary Taiwan

 slip away
      v 1: leave furtively and stealthily; "The lecture was boring and
           many students slipped out when the instructor turned
           towards the balckboard" [syn: steal away, sneak away,
            sneak off, sneak out]
      2: pass by; "three years elapsed" [syn: elapse, lapse, pass,
          slip by, glide by, go by, slide by, go along]