WordReference Random House Unabridged Dictionary of American English © 2020
spiff1  (spif ),USA pronunciation v.t. [Informal.]
  • to make spiffy (usually fol. by up):Let's spiff up this office with new furniture.
    • 1875–80; perh. verb, verbal use of dialect, dialectal spiff well-dressed; see spiffy

    spiff2  (spif ),USA pronunciation [Slang.]
    n. 
    1. Slang Termsa bonus or other form of remuneration given to retail salespeople for promoting the products of a particular manufacturer.

    v.t. 
    1. Slang Termsto reward (a salesperson) with a spiff.
    • origin, originally uncertain 1855–60

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