同歸於盡

同归于尽
tóngguīyújìn
  1. to die in such a way that sb (or sth) else also perishes
  2. to take sb down with oneself
  3. to end in mutual destruction

CEDICT

to perish together with one's foe

Wiktionary

一同毀滅或死亡。

重編國語辭典

Entry Composition

1 同歸 tóngguī
  1. (literary) to return together
  2. to return together
2 於 yú
  1. (of time or place) in; at; on
  2. (indicating any indirect relation) to; toward; vis-à-vis; with regard to; for
  3. (indicating a source) from; out of
  4. (used in comparison) than
  5. (used in the passive voice) by
3 盡 jìn
  1. to use up
  2. to exhaust
  3. to end
  4. to finish
  5. to the utmost
  6. exhausted
  7. finished
  8. to the limit (of sth)
  9. all
  10. entirely