Source : WordNet®

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}]