魚沉雁杳 [鱼－－－]

Jyutping jyu4 cam4 ngaan6 miu5
Pinyin yú chén yàn yǎo

Definitions (CC-CEDICT)
  1. lit. the fish sinks, the goose vanishes into the distance (idiom); a letter does not arrive
  2. lost in transmission
Definitions (Wiktionary)
  1. phrase, idiomatic
    See 雁杳魚沉／雁杳鱼沉 (yànyǎoyúchén).