What is Duff up?
Duff up definition and meaning on Dictionary terms:
(in Continental Europe) the male ruler of a duchy; the sovereign of a small state.
a British nobleman holding the highest hereditary title outside the royal family, ranking immediately below a prince and above a marquis; a member of the highest rank of the British peerage.
a nobleman of corresponding rank in certain other countries.
a cultivated hybrid of the sweet and sour cherry.
dukes, Slang. fists; hands: Put up your dukes.
verb (used with object), duked, duk