To be carried away by extreme joy, excitement, or complacency, losing self-awareness or composure; to forget oneself in a moment of triumph or delight.
他一听到自己作品获奖的消息，顿时忘乎其形，高兴得手舞足蹈
As soon as he heard the news that his work had won an award, he was so carried away with joy that he started gesticulating wildly.
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