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spiff

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spiff/ˈspɪf/verb
spiffsspiffedspiffing
spiff
/ˈspɪf/
verb
spiffsspiffedspiffing
Learner's definition of SPIFF  

spiff up

[phrasal verb]
spiff (someone or something) upUS, informal or spiff up (someone or something) 
: to make (someone or something) neater or more attractive
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