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The term "bosom friend" is the original english term which is used alot in old books. It comes from the Latin phrase "sodalis pectoris" which means "friend/companion of the soul/bosom", because the Romans believed that the heart and the chest were the seat of the soul. As for the buddy part; The word buddy is an American word, and not widely used anywhere else. Somewhere over the course of 1900's the word swap was used & instantly caught on because of it's alliteration. It definately caught on in the entertainment industry; a few songs and a TV show were named the phrase.

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13y ago

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