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idg. kob „to suit, fit, succeed” >engl. happen, engl. happiness, engl. happy ;
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The arrow ">" does not always mean an etymological derivation.
Sometimes it may be just a conjecture (even a refuted one), or an error.
Take the tree as a suggestion for lookup, e.g. try http://etymonline.com/index.php?search=happySimilar words
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