Where does “koppen” come from?

koppen (Dutch) comes from Dutch kop, from Middle Dutch cop, from Latin cūppa, from Latin cūpa, from Ancient Greek κώπη, from Proto-Indo-European kóh₂p-eh₂, from Proto-Indo-European keh₂p- — to seize, grab; to seize; take up; lift; to take,...

koppen (Dutch): To strike with the head; as in soccer, to head;...