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Godan verb with 'gu' ending, intransitive verb
to make merry, to frolic, to be in high spirits
word usually written using kana alone-
そんな些細なことで、鬼の首を取ったようにはしゃがなくてもいいじゃない。
There's no sense acting all triumphant like a conquering hero over such a minor thing.
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