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Jyutping mong4 nin4 gaau1
Pinyin wàng nián jiāo

Definitions (CC-CEDICT)
  1. friends despite the difference in age
Definitions (Wiktionary)
  1. noun
    friends despite the difference in age
    (syn.) 忘年之交
Definitions (Kaifangcidian)
  1. (沒有對應漢語詞彙)