大の虫を生かして小の虫を殺す

だいのむしをいかしてしょうのむしをころす

[dainomushiwoikashiteshounomushiwokorosu]

Definitions

1.expressions (phrases, clauses, etc.); Godan verb with 'su' ending

sacrifice something small in order to save something great; lose a leg to save one's life; to let a large bug live and kill a small one