- 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
- obscure, bedim, overcloud - make obscure or unclear; "The distinction was obscured"
--2 is one way to change, alter, modify
Sample sentences:
Somebody ----s something
Something ----s something