出处：按学科分类—语言、文字 中国对外翻译出版公司《汉英成语词典》第160页（231字）
比喻做事情开始很起劲，到后来却松懈了，例做事要有始有终，虎头蛇尾的人，永远不会有成功的希望。
There is beginning and an end to everything one does．To have a magnificent start only to tail off later certainly does not augur well．