Definition from Wiktionary, the free dictionary
From Dutch snoepen (“to pry, eat in secret, sneak”). Related to Dutch and Low German snappen (“to bite, seize”), Dutch snavel (“beak, bill, pecker, neb”), German Schnabel (“beak, bill, mouth”). More at snap.
- Rhymes: -uːp
- To be devious and cunning so as not to be seen
- To secretly spy on or investigate, especially into the private personal life of others.
- If I had not snooped on her, I wouldn't have found out that she lied about her degree.
Related terms 
To secretly spy on or investigate, especially into the private personal life of others
snoop (plural snoops)
- The act of snooping
- One who snoops
- Be careful what you say around Gene because he's the bosses' snoop.
- A private detective
- She hired a snoop to find out if her husband was having an affair.
The act of snooping
One who snoops
A private detective
- 1996, T.F. Hoad, The Concise Oxford Dictionary of Etymology, Oxford University Press, ISBN 0192830988