intercede

1. V-I If you intercede with someone, you try to persuade them to forgive someone or end their disagreement with them. 代为求情; 调解[正式]

They asked my father to intercede with the king on their behalf. 他们请我父亲代他们向国王求情。

It has also asked Britain and the United States to intercede. 它也请了英国和美国出面调停。