老死不相往来

Explanation: Means no contact with each other, not exchange. 　　Usage: Complex sentence; as predicate, attributive; describe contact with each other has not occurred 　　Source: Qin Lier "I": "neighbors across the sea, just a few kilometers can hear the voice, the people to die of old age, not in contact." Thesaurus:  lycorisradiata, manjusaka, zhanglanghua, longzhaohua, laoyasuan, suantoucao, youlinghua, diyuhua, shezihua, shanwudu, a sudden clap of thunder, mandarava