To dicker is to talk or argue with someone about the conditions of a purchase, agreement, or contract.

// My favorite thing about flea markets is dickering over prices.

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“They haggled and dickered and bargained through a good number of dealerships.” — Terry Woster, Tri-State Neighbor (Sioux Falls, South Dakota), 7 Dec. 2023

The origins of the verb dicker likely lie in an older dicker, the noun referring to a quantity of ten animal hides or skins. The idea is that the verb arose from the bartering of, and haggling over, animal hides on the American frontier. The noun dicker comes from decuria, the Latin word for a bundle of ten hides, and ultimately from the Latin word decem, meaning "ten." The word entered Middle English as dyker and by the 14th century had evolved to dicker.