死信 [－－]

Jyutping sei2 seon3
Pinyin sǐ xìn

Definitions (CC-CEDICT)
  1. lost letter
  2. letter containing news of sb's death
Definitions (粵典–words.hk)
  1. 名詞、術語
    指​地址​唔​正確​而​無法​寄出​嘅​信​，​由​於​冇​回郵​地址​，​只能​夠退​返去​郵局​，​一段​時間​內​都​辨認​唔​到​收信人​同​地址​，​又​冇​人​認領​，​最​後​只能​夠棄​置​（​量​詞​：​封​）
    dead letter
Definitions (Wiktionary)
  1. noun
    dead letter
  2. noun
    news of someone's death