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1.
The opposite of silver lining. When good (or bad) news includes worse, additional information.
Boss: Well, Jimmy, you got the internship!

Jimmy: Dope.

Boss: ...the brown lining is its unpaid.

Jimmy: Rats.
by BobbyStompy February 09, 2011
 
2.
Brownlining is fishing discolored water for fish most anglers avoid, and are not typically eaten. Muddy creeks filled with farm effluent and debris, urban rivers choked by trash and runoff from streets are brownline waterways.
I'm going Brownlining, hopefully I won't get any on me.
by kbarton10 September 20, 2008