1821  (1939)  The sky blues . . . swelled at the word "commission."
1830  (1947)  I have even beat up the quarters of some of the old Sky Blues on their own territories.
1955  Black instantly took offence and, in accordance with his pledge, proceeded to act "as honestly and zealously for" the flouted Sky Blues as he had once "acted honestly and zealously against them": he challenged Douglas to a duel.