Verb slip away has 2 senses
  1. slip away, steal away, sneak away, sneak off, sneak out - leave furtively and stealthily; "The lecture was boring and many students slipped out when the instructor turned towards the balckboard"
    --1 is one way to leave, go forth, go away
    Sample sentence:
    Somebody ----s
  2. elapse, lapse, pass, slip by, glide by, slip away, go by, slide by, go along - pass by; "three years elapsed"
    --2 is one way to advance, progress, pass on, move on, march on, go on
    Sample sentences:
    Something ----s
    Something is ----ing PP
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