slip away (
http://definr.com/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, as of time [syn:
elapse,
lapse,
pass, {slip
by},
glide by,
go by,
slide by,
go along]