sneak
adjective
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marked by quiet and caution and secrecyfurtive
noun
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someone acting as an informer or decoy for the policecanary
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someone who prowls or sneaks aboutprowlerstalker
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a person who is regarded as underhanded and furtive and contemptible
verb
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to go stealthily or furtively“..stead of sneaking around spying on the neighbor's house”creep
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pass on stealthilyslip
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make off with belongings of otherspinch
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put, bring, or take in a secretive or furtive manner“sneak a look”