鏡かがみを抜ぬく

expression, godan verb (-ku)

uncask; open a barrel

Idiomatic expression literally meaning 'to pull out the mirror', referring to opening a sake barrel by removing the round wooden lid (mirror). Used in ceremonial contexts.

• 祝しゅく宴えんで、新しん郎ろう新しん婦ぷが鏡かがみを抜ぬいた。

  At the banquet, the bride and groom opened the sake barrel.