逆さかさ柱ばしら

noun

inverted pillar; pillar placed upside down

Refers to a wooden pillar intentionally placed with its base pointing upward, traditionally believed to cause ominous phenomena or bad luck. Often encountered in folklore or discussions of traditional building superstitions.

See also: 逆柱

• 古ふるい家いえでは、逆さかさ柱ばしらが不ふ吉きつな現げん象しょうを招まねくと信しんじられていた。

  In old houses, it was believed that an inverted pillar would invite ominous phenomena.