Sneak Definition
 snēk 
  sneaked, sneaking, sneaks, snuck
  
    verb
  
 
    sneaked, sneaking, sneaks, snuck
  
To move quietly and stealthily so as to avoid being seen or heard; go furtively.
 Webster's New World 
To give, put, carry, take, etc. secretly or in a stealthy, sneaking manner.
 Webster's New World 
To be a sneak; behave in a stealthy, underhanded, or cowardly manner.
 Webster's New World 
To take something stealthily without permission.
I went to sneak a chocolate but my dad caught me.
 Wiktionary 
(intransitive) (informal, especially with on) To inform an authority about another's misdemeanours; to tell tales; to grass.
 If you sneak on me I'll bash you!
 Wiktionary 
    noun
  
 
    sneaks
  
A person who sneaks; stealthy, underhanded, contemptible person.
 Webster's New World 
An instance of sneaking; a quiet, stealthy movement.
 American Heritage 
An act of sneaking.
 Webster's New World 
A sneaker.
 American Heritage 
Webster's New World 
    adjective
  
 Carried out in a clandestine manner.
 Sneak preparations for war.
 American Heritage 
Without warning; stealthy.
 A sneak attack.
 Webster's New World 
In advance; before release to the general public.
 The company gave us a sneak look at their new electronic devices.
 Wiktionary 
Synonyms: 
  
    idiom
  
 
      sneak up (on)
    
 - to approach (someone) by or as by stealth
 
Webster's New World  
Other Word Forms of Sneak
Noun
Singular:
 sneakPlural:
 sneaksIdioms, Phrasal Verbs Related to Sneak
Origin of Sneak
-  
From Middle English sniken (“to creep, crawl"), related to Old English snÄ«can (“to desire, reach for sneakily"), from Proto-Germanic *snÄ«kanÄ…, which is related to the root of snake.
From Wiktionary
 Probably akin to Middle English sniken to creep from Old English snīcan
From American Heritage Dictionary of the English Language, 5th Edition
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