After winning the lottery she beamed with joy, unable to hide her excitement.
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From 贞观政要 (Essentials of Government of the Zhenguan Era): 太宗闻其言，喜形于色 - the Tang emperor Taizong, upon hearing wise counsel, 'showed his joy on his face.' 形 here means 'to manifest,' 色 means 'facial expression.' Antonym: 不动声色 (betraying nothing).
