E. Cobham Brewer 18101897. Dictionary of Phrase and Fable. 1898.
Stiff.
An I.O.U.; a bill of acceptance. Hard, means hard cash. Did you get it stiff or hard? means by an I.O.U. or in cash. Of course stiff refers to the stiff interest exacted by money lenders.
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His staff was floating about in too many directions, at too many high figures.Ouida: Under Two Flags, chap. vii.