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You know that feeling when you’re about to finish a particular thought and suddenly someone else, a friend or a stranger, finishes your sentence better than you possibly could have? Is there a word for that in English, or in any language?

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I don't know of a particular word for "friendly sentence finisher" but kindred spirit may sum up your feelings about that person if they always feel the same way you do about things. – Jim Nov 2 '13 at 23:18
    
This is a pretty interesting question, but I'm afraid there may be no single-word answer. – snailplane Nov 3 '13 at 1:37
    
He's a smartass. – Omega Nov 3 '13 at 10:39
    
Jinx! You owe me a Coke – Oldcat Apr 18 '14 at 18:48

When that happens, it is common to say "you took the words right out of my mouth" or "you read my mind"

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I think the word you're looking for is co-narration.

I'm currently taking a communications class, and that is the word used when people who are in a relationship (close or otherwise) finish each other's sentences because they have enough knowledge to infer what the person is trying to say.

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Dude.

However consider adding an adjective.

E.g. Awesome dude.

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3  
Did you pick your username before or after you decided to write this answer? :-) – snailplane Nov 3 '13 at 1:25

In any language? In France we call that person "sauveur" (=lifesaver).

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So, A "life saver" is often used to address someone who's been such a great help for you, including finishing things better than you could possibly have.

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Someone who brings the wrong kind of closure could be called a terminator.

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Since an already existing answer seems unlikely, may I humbly suggest the term clauseguard?

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