位い牌はいを汚けがす

expression, godan verb (-su)

disgrace one's ancestors; tarnish the family honor

Idiomatic expression literally meaning 'to defile the ancestral tablets'. Used when someone's actions bring shame upon their family or ancestors.

• 犯はん罪ざいを犯おかして位い牌はいを汚けがすようなことはするな。

  Don't do anything that would disgrace your ancestors, like committing a crime.