kidney

1. (figuratively, dated) Constitution, temperament, nature, type, character, disposition. (usually used of people)Examples: "[…] think of that, – a man of my kidney, – think of that, […]"; "Millions in the World of this Man's Kidney"; "30th June, 1788, Robert Burns, letter to Mr Robert Ainslie Your poets, spendthrifts, and other fools of that kidney, pretend, forsooth, to crack their jokes on prudence."datedfiguratively

2. (obsolete, slang) A waiter.Examples: "I once more desire my readers to consider that as I cannot keep an ingenious man to go daily to Will's under twopence each day merely for his charges, to White's under sixpence, nor to the Grecian without allowing him some plain Spanish, to be as able as others at the learned table; and that a good observer cannot speak with even Kidney at St. James's without clean linen; […]"obsoleteslang