verb: Screwed up, botched, ruined. Something is said to be "lindened" when a situation is made worse by an action that was intended to make things better.
The principle that every bad situation produces something good or teaches some lesson. It is derived from the fact that clouds, even though dark, often have bright silver edges where the sun reflects.
2020 was a terrible year, but the silver lining was I got to do school from the comfort of home, finally wasn't constantly busy, got to play lots and lots of video games, and learned to appreciate a normal world.