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Jyutping sek6 cam4 daai6 hoi2
Pinyin shí chén dà hǎi

Definitions (CC-CEDICT)
  1. lit. to throw a stone and see it sink without trace in the sea (idiom)
  2. fig. to elicit no response
Definitions (粵典–words.hk)
  1. 語句
    比喻​冇​晒​消息​;​消失​、​冇​人會知
    to disappear without a trace
    • 真相隨住佢嘅死已經石沉大海。
      真相随住佢嘅死已经石沉大海。
      zan1 soeng3 ceoi4 zyu6 keoi5 ge3 sei2 ji5 ging1 sek6 cam4 daai6 hoi2.
      The truth vanished without a trace together with his death.
Definitions (Wiktionary)
  1. phrase, idiomatic
    to receive no response; to never hear back from someone or about something
Definitions (Kaifangcidian)
  1. (沒有對應漢語詞彙)
Examples (粵典–words.hk)
  1. Cantonese
    真相随住佢嘅死已经石沉大海。
    真相隨住佢嘅死已經石沉大海。
    zan1 soeng3 ceoi4 zyu6 keoi5 ge3 sei2 ji5 ging1 sek6 cam4 daai6 hoi2.
    • The truth vanished without a trace together with his death.