Definition of "dicker"

In the brilliant sparkle of the morning when everything that was not superlatively blue was superlatively green, I dickered with a man who was taking a party up the inlet that he should drop me off at the village I was headed for.

1941, Emily Carr, chapter 6, in Klee Wyck‎

Then, the white men who penetrated to those semi-wilds were always ready to "dicker" and to "swap," and to "trade" rifles, and watches, and whatever else they might happen to possess, almost to their wives and children.

1848, James Fenimore Cooper, chapter 2, in The Oak Openings‎

They sat in a booth near the door and drank the first cold ones of the evening while watching three impassioned pinballers dickering with flashing, promising, tilting machines.

1981, Jack Cady, Singleton

Hobs [the Tanner of Tamsworth]. […] My taking is more than my spending, for here's store left. I have spent but a groat; a penny for my two jades, a penny to the poor, a penny pot of ale, and a penny cake for my man and me, a dicker of cowhides cost me.

1599, attributed to Thomas Heywood, Edward IV, Part One, Act III, Scene 1

The dicker, or daker, was ten, and is found, though generally at later times than the period before us, as a measure for hides and gloves.

1866, James Edwin Thorold Rogers, A History of Agriculture and Prices in England, volume 1, page 171

“Grant that the North’s insulted, scorned, betrayed,O'erreached in bargains with her neighbor made,When selfish thrift and party held the scalesFor peddling dicker, not for honest sales,—Whom shall we strike? Who most deserves our blame?

1856, John Greenleaf Whittier, The Panorama‎