"An exclusively Nordic word with no certain etymology. It seems attractive to me, however, to connect the word to Swiss German gōppə v. 'to play (of cats)' < *gaubb-" (GK). But compare also OE géopan v. 'to devour', ON gapa 'animal's mouth' etc. (Falk & Torp). Unrelated to *geupan- v. 'to be hollow'." (GK)
Guus Kroonen. Etymological Dictionary of Proto-Germanic. Indo-European Etymological Dictionaries Online. Edited by Alexander Lubotsky. Brill. Brill Online.
De Vries, Jan (1977). Altnordisches etymologisches Wörterbuch. 3rd ed. Leiden: Brill
Robert Farren, PIE culture words collection, 2017
OF11, OF13, OF15, OF19, OF21, OF23, OF25
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