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English word happen comes from Old Norse heppinn, Proto-Germanic *hampijaną (To fit in, be fitting. To occur, happen.)
heppinn (Old Norse)
*hampijaną (Proto-Germanic)
To fit in, be fitting. To occur, happen.
happyn (Middle English)
hapnen (Middle English)
happen (English)
(followed by, _, on or upon) To encounter by chance.. To occur or take place.. To occur unexpectedly, by chance or with a low probability. (obsolete or dialect) maybe, perhaps.