The supplier asked to re-negotiate the contract terms due to rising raw material costs.

re-negotiate 由前缀 re-（表示"再次"）和动词 negotiate（谈判）组成，字面意思是"再次谈判"，即"重新谈判"。 negotiate 来自拉丁语 negotiari，由 neg-（不）和 otium（空闲）组成，原意为"做生意"，后来引申为"谈判、协商"的意思。