for some reason considered undesirable within an industry.
black market-
Buying or selling things illegally. This does not refer to an actual
market and does not have a physical place.
black sheep-
Someone who does not fit in with a larger group (like a family)
because of differences in behaviour, interest, or opinion.
black tie-
One of the most formal dress codes reserved for very important
events that occur in the evening.
blue sky-
Literally a sky without clouds. It can also denote when there is sun
or very nice weather.
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