Probably a reduced form of עקבויער (ekboyer, literally “corner drill”), from עק (ek) + בויער (boyer).
עקבער • (ekber) m, plural עקבערס (ekbers)
- drill
- Synonyms: בויער (boyer), באָר (bor)
- Justus van de Kamp et al., “עקבער” in Jiddisch-Nederlands Woordenboek [Yiddish-Dutch Dictionary], Amsterdam: Stichting Jiddische Lexicografie, 1987-present (ongoing). [1].