Verb cloud over has 2 senses
  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
  2. cloud over - become overcast; "the sky clouded over"
    --2 is one way to
    change state, turn
    Sample sentence:
    Something ----s
,
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