Meaning of “sneak” - Learner’s Dictionary

sneak

verb us uk /sniːk/ past tense and past participle sneaked, also US informal snuck
sneak into/out/around, etc

to go somewhere quietly because you do not want anyone to hear you:

I sneaked into his bedroom while he was asleep.
sneak sth into/out of/through, etc

to take something somewhere without anyone seeing you:

We tried to sneak the dog into the hotel.
sneak a look/glance at sb/sth

to look at someone or something quickly and secretly:

I sneaked a look at the answers.

See also

(Definition of “sneak verb” from the Cambridge Learner’s Dictionary © Cambridge University Press)