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sneak

1 sneak /ˈsniːk/ verb
sneaks; sneaked or chiefly US snuck /ˈsnʌk/ ; sneaking
1 sneak
/ˈsniːk/
verb
sneaks; sneaked or chiefly US snuck /ˈsnʌk/ ; sneaking
Britannica Dictionary definition of SNEAK
always followed by an adverb or preposition, [no object] : to move quietly and secretly in order to avoid being noticed
[+ object] : to take or bring (something) secretly and often quickly
[no object] British, 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
2 sneak /ˈsniːk/ noun
plural sneaks
2 sneak
/ˈsniːk/
noun
plural sneaks
Britannica Dictionary definition of SNEAK
[count]
US, informal : a person who acts in a secret and usually dishonest way
British, old-fashioned : tattletale
American football : quarterback sneak
3 sneak /ˈsniːk/ adjective
3 sneak
/ˈsniːk/
adjective
Britannica Dictionary definition of SNEAK
always used before a noun
: done while others are not paying attention