An Etymological Dictionary of the German Language/jauchzen
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jauchzen, vb., ‘to shout for joy, exult,’ from MidHG. jûchezen, ‘to cry out, shout for joy,’ OHG. *jûhhazzen; probably a derivative of the MidHG. interjs. jûch, jû (expressions of joy); comp. ächzen, allied to ach.