(a state or time of) very thick mist
cover sth with fog
become difficult to see through because of a misty covering
puzzle or confuse
"The stars are obscured by the clouds"
"the big elm tree obscures our view of the valley"
Then fog came down..and hid the seas.
出自： J. Masefield
Somtimes by clouds it [the sun] is enueloped, and by mists fogged.
出自： W. Barlow
Hot steam drifted about her, fogging up the window.
出自： A. Higgins