由于快乐而忘记了忧愁。形容非常快乐。
《论语·述而》发愤忘食，乐以忘忧。”
似这等～，胡必归欤！★元·王实甫《丽春堂》第三折
Learn the next connected idiom: 乐以忘忧 (lè yǐ wàng yōu) → 忧心忡忡 (yōu xīn chōng chōng)
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