An Etymological Dictionary of the German Language, J (1891)
by Friedrich Kluge, translated by John Francis Davis
jappen
Friedrich Kluge2507350An Etymological Dictionary of the German Language, J — jappen1891John Francis Davis

jappen, vb., ‘to gape, pant,’ ModHG. only, prop. LG.; comp. Du. gapen, ‘to gape,’ under gaffen.