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DAN004
Since: Aug, 2010
"Good bad luck".
A piece of bad luck turns out to be a good thing, because it prevents something even worse from happening.
Example: Bob has booked a passage on the Titanic. At the last moment, however, something happens — there is an accident and Bob gets his legs broken, or there is a break-in in his flat and his passport gets stolen, so that Bob cannot sail — which of course ends up saving his life...