noun

1. One who sneaks; one who moves stealthily to acquire an item or information.

   “My little brother is such a sneak; yesterday I caught him trying to look through my diary.”

2. A cheat; a con artist.

   “I can't believe I gave that sneak $50 for a ticket when they were selling for $20 at the front gate.”

3. An informer; a tell-tale.

Synonyms: con artist, trickster

verb

1. To creep or go stealthily; to come or go while trying to avoid detection, as a person who does not wish to be seen.

   “He decided to sneak into the kitchen for a second cookie while his mom was on the phone.”

2. To take something stealthily without permission.

   “I went to sneak a chocolate but my dad caught me.”

3. (ditransitive) To stealthily bring someone something.

   “She asked me to sneak her a phone next month.”

Synonyms: grass, snitch, tell tales, skulk

adjective

1. In advance; before release to the general public.

   “The company gave us a sneak look at their new electronic devices.”

2. In a stealthy or surreptitious manner.

   “I was able to get a sneak peek at the guest list.”