Where does “κοῦπα” come from?

κοῦπα (Byzantine Greek) comes from Ancient Greek κοῦπα, from Late Latin cuppa, 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,...