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Wiktionary
sneak up on

vb. To approach a person or animal without being seen or heard

Usage examples of "sneak up on".

So alert were they to the moment that one had to become nearly invisible and completely silent to sneak up on a monk, and even then simply jumping out and shouting “.

If you hadn't managed to sneak up on me, I'd have striped you till you wailed.

Because those Chingers, they want to sneak up on us not only behind our backs &mdash.

Because those Chingers, they want to sneak up on us not only behind our backs - but the vermin want to sneak up yesterday!