Wordnet 3.0
VERB (2)
1. 
 cause to darken; 
2. 
 make brown in color; 
- Example: "the draught browned the leaves on the trees in the yard"[syn: embrown, brown]
The Collaborative International Dictionary of English v.0.48:
Embrown \Em*brown"\, v. t. [Pref. em- (L. in) + brown.]
   To give a brown color to; to imbrown.
   [1913 Webster]
         Summer suns embrown the laboring swain.  --Fenton.
   [1913 Webster]
WordNet (r) 3.0 (2006):
embrown
    v 1: cause to darken
    2: make brown in color; "the draught browned the leaves on the
       trees in the yard" [syn: embrown, brown]