Dun. Some persons imagine this word to be derived from the French donnez - give me, implying a demand for something new; but the true origin of this expression is supposed to be due to one John Dun, a famous bailiff of the town of Lincoln, so extremely active in his business, that it became a proverb when a man refused to pay his debts, to say, " Why don't you Dun him?" that is. "Why don't you send Dun to arrest him ? " Hence it "grew into a custom, and is as old as the days of Henry VII.