Noun clouding up has 1 sense
  1. clouding, clouding up - the process whereby water particles become visible in the sky
    --1 is a kind of vaporization, vaporisation, vapor, vapour, evaporation
,Verb cloud up has 1 sense
  1. overcloud, cloud over, cloud up - become covered with clouds; "The sky clouded over"
    --1 is one way to darken
    Sample sentences:
    Something ----s
    It is ----ing
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