Wiktionary
vb. To enter without being noticed
WordNet
Usage examples of "sneak in".
I had my door key with me and all, and I figured what I'd do, I'd sneak in the apartment, very quiet and all, and just sort of chew the fat with her for a while.
She just had to sneak in to the bar and check them out, see where their ship was, what they were doing.
I had to take a grammar course and write term papers, so I learned how to sneak in a few hours at the library.
They come out from the city and try to sneak in, usually hit one place, and run.
All you had to do to prevent unauthorized entry was monitor port facilities and watch the front door because there were no back ones to sneak in through.
Carrier Group 19 had been able to sneak in closer than she'd dared hope, but she was still too far out to detect drone launches.
They might not be able to slip free by the same route they used to sneak in.
In a few more minutes I'd trade it for the lot at the Top Hat Club and sneak in once again by the stage entrance to her dressing room.
Morse is the kind who'd step on you, then sneak in a nice kick to the crotch and never break a sweat.
Practically it was much better to sneak in easy and avoid any more trouble with meteorites—.