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WordNet-Online 
 Definitions from WordNet
Verb cloud up has 1 sense 
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| Definitions from the WebCloud UpDefinition:Cloud up refers to the process or action of the sky becoming overcast with clouds or gathering clouds. Parts of Speech:
 Sense 1:As a verb, cloud up means to become covered with clouds or to bring clouds into the sky. Example sentences:
 Sense 2:As a phrasal verb, cloud up means to become angry, upset, or show a gloomy mood. Example sentences:
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