From a (“to, at”) + baixu (“low”). Compare Portuguese and Galician abaixo.
abaixu
- (Lagarteiru, Mañegu) down, downwards
- Valeš, Miroslav (2021) Diccionariu de A Fala: lagarteiru, mañegu, valverdeñu (web)[1], 2nd edition, Minde, Portugal: CIDLeS, published 2022, →ISBN