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功败垂成
A slip betwixt the cup and the lip.
A flash in the pan.
eg: Tom is disqualified at the final round, a slip betwixt the cup and the lip.
中英俚语俗语来源：汉书：“垂成之功，败于一日。”
同义词：功亏一篑 Look back from the plough.
反义词：一蹦而就 At one stroke.
n. 笔画，击打，一笔（画）连续的动作，中风，
