verb
/ˈsniːk/ sneaks; sneaked or chiefly US snuck /ˈsnʌk/; sneaking
always followed by an adverb or preposition [no obj] :to move quietly and secretly in order to avoid being noticed
[+ obj] :to take or bring (something) secretly and often quickly
[no obj] Brit old-fashioned :to tell someone (such as a parent or teacher) about something wrong that someone else has done
sneak up on
[phrasal verb]
sneak up on (someone)
to approach (someone) quietly and secretly in order to avoid being noticed
to approach, happen, or develop without being noticed
noun
plural sneaks
[count] US informal :a person who acts in a secret and usually dishonest way
Brit old-fashioned :tattletale
American football :quarterback sneak
adjective
always used before a noun
done while others are not paying attention