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Jyutping mong4 fu4 so2 ji5
Pinyin wàng hū suǒ yǐ

Definitions (CC-CEDICT)
  1. to get carried away
  2. to forget oneself
Definitions (Wiktionary)
  1. phrase, idiomatic
    to forget oneself; to lose self-control; beside oneself (typically as a result of one's own behaviour)
Definitions (Kaifangcidian)
  1. (沒有對應漢語詞彙)
Examples (Wiktionary)
  1. Mandarin
    忘乎所以
    忘乎所以
    wàng hū suǒ yǐ
    • to lose self-control (literally, "to forget how one should conduct oneself")