大義親を滅す
also: たいぎおやをほろぼす
Meanings
1
sacrifice family for a greater cause
A set phrase expressing the idea that one must sometimes put a higher moral or public duty above personal family ties. Often used in historical or dramatic contexts.
He served his country with the resolve to sacrifice family for a greater cause.
The phrase 'taigi shin o messu' represents the dilemma between loyalty and filial piety.