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1. Made dirty or foul
   "breathing air fouled and darkened with factory soot"
   - befouled
    
2. Especially of a ship's lines etc
   - afoul, foul

1. Hit a foul ball
    
2. Make impure
   - pollute, contaminate
    
3. Become or cause to become obstructed
   - clog, choke off, clog up, back up, congest, choke
    
4. Commit a foul; break the rules
    
5. Spot, stain, or pollute
   - befoul, defile, maculate
    
6. Make unclean
   "foul the water"
    
7. Become soiled and dirty

See also: dirty, soiled, tangled, unclean

Type of: attaint [archaic], begrime, bemire [archaic], block, change, close up, colly [archaic], dirty, disgrace, dishonor [US], dishonour [Brit, Cdn], grime, hit, impede, jam, obstruct, obturate, occlude, play, shame, soil

Encyclopedia: Foul