GNU Collaborative International Dictionary of English

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Found one definition

1.       
   Fog (?), v. t. [imp. & p. p. Fogged (#); p. pr. & vb. n. Fogging (#).]
   1. To envelop, as with fog; to befog; to overcast; to darken; to obscure.
   
   [1913 Webster]
   
   
   2. (Photog.) To render semiopaque or cloudy, as a negative film, by exposure to stray light, too long an exposure to the developer, etc.
   
   [Webster 1913 Suppl.]