spiff (spĭf) Informal
tr.v. spiffed, spiff·ing, spiffs
To make attractive, stylish, or up-to-date: spiffed up the old storefront.
Attractiveness or charm in appearance, dress, or manners: "He may need more than spiff to get him through the bad patches ahead" (James Wolcott).
[Possibly from dialectal spiff, well-dressed.]
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2019 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Indo-European & Semitic Roots Appendices
Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:
The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.