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Jyutping ngaan6 miu5 jyu4 cam4
Pinyin yàn yǎo yú chén

Definitions (Wiktionary)
  1. phrase, idiomatic
    the goose has flown too far away to be traced and the fish has dived deep in water; without any contact; without news or letters
    (syn.) 魚沉雁杳, 鱼沉雁杳