Wiktionary
vb. To leave a place, or a meeting, without being seen or heard
WordNet
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 away, sneak out]
Usage examples of "sneak off".
Using the Power was no way to sneak off quietly, and talking their way clear would leave traces for Galad to follow.
But all I could hit was the tree, and the sun was going down and I was afeared if I didn't get him before dark he'd manage to sneak off.
Longo picked off a clever little devil trying to sneak off at low altitude, whipping between boulders in turns so tight it lost wing feathers every time.
Watch so you don't sneak off like the wretched novices the pair of you should be.
Gollum had just begun to sneak off on his own, and he was crawling away on all fours through the fern.
Jeggred, it will be your responsibility to make sure she doesn't try to sneak off.