争辩 (zhēng biàn) means 'to argue, to dispute' — it emphasizes trying to prove your point through reasoning or debate, often in a calm or logical way. It is less emotional than 争吵 (zhēng chǎo 'to quarrel'), which implies shouting or anger, and more focused on verbal reasoning than 争执 (zhēng zhí 'to wrangle'), which suggests a stubborn standoff.