1) Cause to darken 2) Darken 3) Make brown in color 4) To become brown or dusky 5) To darken, become dark 6) To darken, make dark 7) To make brown or dusky 
• (v. t.) To give a brown color to; to imbrown.
Em·brown' transitive verb [ Prefix em- (L. in ) + brown .] To give a brown color to; to imbrown. « Summer suns embrown the laboring swain.» Fenton. 
[v] - cause to darken 2. [v] - make brown
verb make brown
to make or become brown or dark.