ˊㄔㄣˊchénㄧㄢˋyànㄧㄠˇyǎo

  1. 比喻音訊斷絕·粉蝶·蕭疏··魚沉雁杳瓶墜簪折咫尺。」金瓶梅·七七》:誰人比目魚分開瓶墜簪折今日魚沉雁杳。」魚沉雁渺」。泥牛入海杳無音信

lit. the fish sinks, the goose vanishes into the distance (idiom)​; a letter does not arrive, lost in transmission