(intransitive) To bargain, haggle or negotiate over a sale.
(intransitive) To barter.
(intransitive) To fiddle.
noun
(obsolete) A unit of measure, consisting of 10 of some object, particularly hides and skins.
1599, attributed to Thomas Heywood, Edward IV, Part One, Act III, Scene 1, https://books.google.ca/books?id=d_MuAAAAYAAJ&printsec=frontcover#v=onepage&q&f=false
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.
(US) A chaffering, barter, or exchange, of small wares.