yàn​zú​chuán​shū

to send a letter

雁足传书 雁足傳書 yàn​zú​chuán​shū
to send a letter
To send a letter or stay in touch via mail; this idiom originates from a legend where the Han official 苏武 sū​wǔ used a wild goose to carry a message back home while he was being held captive

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