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English definition of “duff”

duff

adjective uk   /dʌf/ UK informal us  
bad, not useful, or not working: He's directed so many movies that you might expect a few duff ones.

duff

noun [C] uk   /dʌf/ US informal us  
a person's bottom: Get off your duff and start working.

duff

verb [T] uk   /dʌf/ Australian English informal us  
to steal farm animals by changing the brand (= owner's mark) on them, or to steal goods by changing their appearance
Phrasal verbs
(Definition of duff from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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