Foul Definition
 foul 
  fouled, foulest, fouling, fouls, fouler
  
    adjective
  
 
    foulest, fouler
  
So offensive to the senses as to cause disgust; stinking; loathsome.
 A foul odor.
 Webster's New World 
Extremely dirty or impure; disgustingly filthy.
 Webster's New World 
Having a bad odor or taste.
 Foul breath; food that tasted foul.
 American Heritage 
Putrid; rotten.
 Webster's New World 
Full of or blocked up with dirt or foreign objects.
 A foul pipe.
 Webster's New World 
Synonyms: 
  
    noun
  
 
    fouls
  
An infraction or a violation of the rules of play.
 American Heritage 
Anything foul.
 Webster's New World 
An entanglement or a collision.
 American Heritage 
An instance of clogging or obstructing.
 American Heritage 
A foul copy of a document.
 American Heritage 
    adverb
  
 In a foul way.
 Webster's New World 
In or into the part of the field that lies outside the foul lines.
 Webster's New World 
Synonyms: 
  
    verb
  
 
    fouled, fouling, fouls
  
To make foul; dirty; soil; defile.
 Webster's New World 
To dishonor or disgrace.
 Webster's New World 
To impede or obstruct.
 Webster's New World 
To entangle or catch (a rope, for example).
 American Heritage 
To break the rules of a game.
 Webster's New World 
Synonyms: 
  
    idiom
  
 
      foul out
    
 - to be retired as batter by the catch of a foul ball
- to be disqualified from further play for having committed a specified number of personal fouls
Webster's New World  
      foul up
    
 - to make a mess of; make disordered or confused; bungle
Webster's New World  
      run foul of
    
 - to collide with or become entangled in
- to get into trouble with
Webster's New World  
Origin of Foul
-  Middle English from Old English fūl pū̆- in Indo-European roots From American Heritage Dictionary of the English Language, 5th Edition 
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