Wiktionary
sneak away
vb. To leave a place, or a meeting, without being seen or heard
WordNet
sneak away
v. leave furtively and stealthily; "The lecture was boring and many students slipped out when the instructor turned towards the balckboard" [syn: slip away, steal away, sneak off, sneak out]
Usage examples of "sneak away".
All of the disciples except Bartholomew and me had managed to sneak away when the Roman walked up.
If we can, Tonio and I will put the place under surveillance while you sneak away and whistle us up some backup forces, Probably from Nordau.
It was night and the only light in the street fell from doors and windows open in hopes the day's heat would sneak away.