As I felt bound to assist him in this, and also to mediate between them; with the view of sparing the mother’s feelings as much as possible, I wrote to her that night.
…to him, laid her arm across his knee, and dropping her head upon it, said: ’If I have any friend here, who can speak one word for me, or for my husband in this matter; if I have any friend here, who can give a voice to any suspicion that my heart has sometimes whispered to me; if I have any friend here, who honours my husband, or has ever cared for me, and has anything within his knowledge, no matter what it is, that may help to mediate between us, I implore that friend to speak!’
There are no more uses of "mediate" in the book.
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By this time the two former friends were hardly speaking to each other and had to call in local elders to mediate.
Malala Yousafzai -- I Am Malala
Im— mediately after we were finished eating, Mambu gave each boy his share of the money.