To bargain or negotiate over the terms of a deal, usually about price; or a trader in leather hides.
The verb comes from Low German 'dicker' or Dutch 'deken' (leather bundle of ten hides). Traders who haggled over batches of ten hides were called 'dickers,' which evolved to mean any negotiation or bargaining.
A 'dicker' was literally someone who sold leather in bundles of ten hides—so haggling over price for these bundles is why we call any negotiation 'dickering'!
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