Verb slip away has 2 senses
- 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
- 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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