Today's Word of the Day means...
"The invitations to the musicale came sliding in by pairs and threes and spade flushes." [O.Henry, "Cabbages & Kings," 1904]Derogatory meaning "black person" is 1928, from the color of the playing card symbol.
To the utmost; in the highest degree: What Aleksandr Solzhenitsyn did for the Gulag he has now done in spades for the Soviet Union as a whole/ I detest them right back, in spades (1929+)
A black person: The spades inhabited Harlem and let the ofays have Wall Street to themselves
[1928+; fr the color of the playing-card symbol and fr the phrase black as the ace of spades]