The translations below need to be checked and inserted above into the appropriate translation tables. See instructions at Wiktionary:Entry layout § Translations.
He decided to sneak into the kitchen for a second cookie while his mom was on the phone.
1885 July 9, The Hamilton Spectator, page 4:
Some of these were dressed most gorgeously, others becomingly, and several sneaked in with fantail bangers, calling themselves "Gentlemen of the Nineteenth Century."
The past and past participle snuck is primarily found in North American English, where it originated in the late 19th century as a dialectal form. It is still regarded as informal by some, but its use appears to be increasing in frequency and acceptability. It is occasionally found in British, Irish and Australian English, too, though regarded as an American form. (See Oxford Dictionaries, The Cambridge Guide to English Usage, Merriam-Webster Collegiate Dictionary, Webster's New World College Dictionary.)
Informally, snook is also often found as the past tense. It is considered nonstandard.
To sneak (take) something is not the same as to steal something. In this sense, sneak typically implies trying to avoid a supervisor's or guardian's mild displeasure or mild discipline, while steal indicates a more serious action and often the person stealing does not know the owner of the item being stolen.
The translations below need to be checked and inserted above into the appropriate translation tables. See instructions at Wiktionary:Entry layout § Translations.
1984, 8:38 from the start, in Dune[1] (Science Fiction), →OCLC:
I have ordered House Atreides to occupy Arrakis to mine the spice, thus replacing their enemies the Harkonnens. House Atreides will not refuse because of the tremendous power they think they will gain. Then, at an appointed time, Baron Harkonnen will return to Arrakis and launch a sneak attack on House Atreides. I have promised the Baron five legions of my Sardaukar terror troops.