have an axe to grind别有用心；另有企图；怀有私心
have an axe to grind是个源自美国的成语，字面意思是让斧头磨一磨，寓意是to have private interests to serve；to have sth to gain for oneself；to have a selfish reason等之意。
据英国《朗曼英国成语词典》等记述。这个成语出自美国著名的政治家、科学家本杰明富兰克林所写的一则故事。富兰克林幼年时，在院子里遇到一个带有斧头的陌生人，那人称赞院子里那个磨石 很好，想看看它好不好使，便花言巧语的让他转动磨石，而那人就在上面磨利自己的斧头。
据美国之音英语广播节目《词汇掌故》说，这个成语出自1810年美国宾夕法尼亚一家报纸上首次刊登的一则故事。故事说的是有个陌生人手持一把斧头，想找磨石来磨利他的斧头。他在街上遇到一个男孩，就问道：好孩子，你爸爸有磨石吗？那男孩就带他到家里来，帮他转动磨石磨斧头。这对一个孩子来说是件艰苦的活，男孩把手都磨破了，累个半死才把斧头磨得闪闪发光。那个人见目的达到，不仅没向小孩道谢，反而教训孩子快点去上学，以免迟到.
2个出典实质上讲的是同一件事。富兰克林作为一位杰出的资产阶级革命家，担任的最后一项公职就是宾夕法尼亚州废奴委员会会长，为废除奴隶制而奔忙，直到生命的最后一息。宾夕法尼亚州一家报纸在富兰克林逝世20周年发表那篇小故事，应该就是他生前所讲的故事。这个故事的寓意很清楚：持斧待磨者 用恭维的话来达到个人目的，人们不要上当受骗。
He may offer you a post in his firm，but he has an axe to grind， he wants to stand well with your father.
His interest in our venture cannot be sincere，because i knew he has an axe to grind.
In the first place，let me assure you，gentlemen，that i have not an axe to grind
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