Definitions
1.adjectiveWorthless; not working properly, defective."Why do I always get a shopping trolley with duff wheels?"
2.nounAn incompetent or clumsy person.
3.nounA player having little skill, especially a golfer who duffs.
4.nounA pedlar or hawker, especially one selling cheap or substandard goods.
5.nounCheap or substandard goods sold by a duffer.
6.nounA cow that does not produce milk.
7.nounA cattle thief or thief of other livestock; one who alters the brands of cattle.
8.nounA racing pigeon that does not perform well.
9.nounAny of various nymphalid butterflies of the genus Discophora.