Past tense of 'dicker': negotiated or bargained, typically over price or terms of a deal.
From 'dicker' + '-ed' (past tense suffix). As the hide traders of old haggled over their merchandise, the verb form 'dickered' became standard for describing any negotiation or haggling.
When historians say medieval merchants 'dickered' over cloth or spices, they're using the exact same word that came from those ancient leather traders!
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