Probably cause hello ends in low so someone thought they would be clever and say hi back.
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I wonder how "meh" became the short version of "I don't care"?
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Origin: First recorded in 1865–70; variant of hallo Origin: 1425–75; late Middle English hy, perhaps variant of hei hey "Hi" is old AF

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Hi isnt the short version of hello its version of "hey" and "hey" is a natural interjection
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Did you graduate high school?
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that's what i've always wondered with "john" becoming "jack"
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It was HAY - How Are You
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What if "hello" became the longer version of "hi"…
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Hello -> Hey -> Hi. It's not rocket science
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1. greeting, 1862, American English (1st recorded reference: speech of a Kansas Indian), originally to attract attention, probably a ...
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"Hi" is older than "hello", and it's from the same origin as "hej" from Scandinavian languages.
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It was how hippies used to greet each other lol
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well, hell was already taken, so...
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Hello...hey...hi thats how.
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I also wonder how 'Bill' became the short form of 'William'
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Or hey
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Maybe from a stutter. People whom he/she greeted where passing and they just thought that it was cool "the in word" at the time.
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