noun
a person who moves in a stealthy or furtive manner
verb
to move in a stealthy or furtive manner, typically in order to avoid being detected or noticed
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The thief managed to sneak in through the back entrance of the museum.
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I'm going to try to sneak in some snacks to the movie theater.
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Let's see if we can sneak in to the concert without tickets.
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She always finds a way to sneak in a mention of her new car in every conversation.