1to die in such a way that sb (or sth) else also perishes
2to take sb down with oneself
3to end in mutual destruction
Example
wǒ men我们bì xū必须xué huì学会xiàng像xiōng dì兄弟yí yàng一样gòng tóng共同shēng huó生活，yào me要么jiù就xiàng像shǎ zi傻子yí yàng一样tóng guī yú jìn同归于尽。
我们必须学会像兄弟一样共同生活，要么就像傻子一样同归于尽。
We must learn to live together as brothers, or we will perish together as fools.