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When I was a student of EFL, I was taught the word "mutual" implies a reciprocal relationship where X does to Y what Y does to X. If John admires Peter as much as Peter admires John, we can say their admiration is mutual. That said, can I say that Charles and I have a mutual friend ?

  • "Charles and I have a friend in common" sounds most natural, and perhaps most informal, to me. "Mutual friend" works too but I've only heard it used in cases like "Alice is a mutual friend of Charles and I", as in @brasshat answer. – seismatica Jul 13 '14 at 1:47
  • @seismatica 'of Charles and I' is a hypercorrection. I'm not sure how 'acceptable' it is (or who decides). – Edwin Ashworth Sep 9 '14 at 8:21
  • @EdwinAshworth When former president Bill Clinton said during a speech in his presidential campaign that "My mother was busy raising my brother and I", the Mainstream Media didn't ignore it and teachers of English were eager to criticize. – Centaurus Sep 9 '14 at 16:24
  • But BBC News announcers adopted the practice of using 'I' with expressions like 'It's goodnight from John and I' for a time. Patricia O'Conner and Stewart Kellerman write 'For centuries, it was perfectly acceptable to use either “I” or “me” as the object of a verb or preposition, especially after “and.” Literature is full of examples. Here’s Shakespeare, in “The Merchant of Venice”: “All debts are cleared between you and I.”' But I agree, I wouldn't use 'I'. – Edwin Ashworth Sep 9 '14 at 18:26
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According to the following source the expression mutual friend, despite language critics objections, is commonly used and accepted.

Mutual: Usage Note,

Mutual is used to describe a reciprocal relationship between two or more people or things. Thus their mutual animosity means "their animosity for each other" or "the animosity between them," and a mutual defense treaty is one in which each party agrees to come to the defense of the other. But many people also use mutual to mean "shared in common," as in The bill serves the mutual interests of management and labor. This usage is perhaps most familiar in the expression our mutual friend, which was widespread even before Charles Dickens used it as the title of a novel. While some language critics have objected to this usage because it does not include the notion of reciprocity, it appears in the writing of some of our greatest authors, including Shakespeare, Edmund Burke, George Eliot, and James Joyce, and it continues to be used by well-respected writers today.

Also Ngram shows a more common use of the expression usual friends compared to the other two suggested alternatives.

Source: The American Heritage® Dictionary of the English Language.

2

Yes, if you and Charles are both friends with Alice, you can refer to Alice as a mutual friend. This allows an implication that you are a friend of Alice, and Peter is a friend of Alice, but you are not necessarily a friend of Peter.

The designation "a common friend" means nearly the same, but has a small risk that someone might wonder if there is a better friend who is better than just common, as in "Eddie is a common friend, but John is in a class by himself."

0

Odd you should choose the name “Charles” for your example; for though purists may agree with your teacher, Mr. Charles Dickens, with his last completed novel, opened the floodgates to the usage [Our] Mutual Friend beyond possibility of shutting.

protected by tchrist Sep 11 '16 at 20:53

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