Definition of “spiff sb/sth up” - English Dictionary

british dictionary

“spiff sb/sth up” in British English

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spiff sb/sth up

US informal
phrasal verb with spiff uk /spɪf/ us /spɪf/ verb

to make someone or something look more stylish, or cleaner and tidier:

He's really spiffed up his wardrobe since he started his new job.

(Definition of “spiff sb/sth up” from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)