noun
central pillar; main pillar
The large central pillar in traditional Japanese architecture that supports the main beam. Used literally.
古い民家の大黒柱は、太くて立派だった。
The central pillar of the old farmhouse was thick and impressive.
noun
Figurative use for a person or thing that is the central support of a group, family, or organization. Often refers to the breadwinner or key figure.
父は家族の大黒柱として、毎日働いている。
My father works every day as the mainstay of our family.
この地域では農業が経済の大黒柱だ。
Agriculture is the backbone of the economy in this region.