cloud in WordNet English dictionary

1. make less visible or unclear
   "The stars are obscured by the clouds"; "the big elm tree obscures our view of the valley"
   obscure  befog  becloud  obnubilate  haze over  fog  cloud  mist 
   
2. colour with streaks or blotches of different shades
   mottle  dapple  cloud 
   
3. make milky or dull
   "The chemical clouded the liquid to which it was added"
   cloud 
   
4. make less clear
   "the stroke clouded memories of her youth"
   cloud 
   
5. place under suspicion or cast doubt upon
   "sully someone's reputation"
   defile  sully  corrupt  taint  cloud 
   
6. make gloomy or depressed
   "Their faces were clouded with sadness"
   cloud 
   
7. billow up in the form of a cloud
   "The smoke clouded above the houses"
   cloud 
   
8. make overcast or cloudy
   "Fall weather often overcasts our beaches"
   overcast  cloud 
   

1. a group of many things in the air or on the ground
   "a swarm of insects obscured the light"; "clouds of blossoms"; "it discharged a cloud of spores"
   swarm  cloud 
   
2. a visible mass of water or ice particles suspended at a considerable altitude
   cloud 
   
3. any collection of particles (e.g., smoke or dust) or gases that is visible
   cloud 
   
4. suspicion affecting your reputation
   "after that mistake he was under a cloud"
   cloud 
   
5. out of touch with reality
   "his head was in the clouds"
   cloud 
   
6. a cause of worry or gloom or trouble
   "the only cloud on the horizon was the possibility of dissent by the French"
   cloud