1878 Trollope South Africa II 458: Bluebacks as they were called were printed, and the bankers issued little scaps of paper, – ‘good-fors’ as they were called – representing minute sums of money.at bluebacks (n.) under blue, adj.1
1878 Trollope South Africa II 458: If he were to decline [...] there would be all the horrors of Bumbledom before him.at bumble, n.1