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N-VAR
欺骗；误导；吓唬；虚张声势
A bluff is an attempt to make someone believe that you will do something when you do not really intend to do it.
例句
The letter was a bluff...
这封信不过是吓唬人罢了。
It is essential to build up the military option and show that this is not a bluff...
关键是要做好采取军事行动的准备，以表明这不是虚张声势。
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PHRASE
（因料到对方不敢行动而）要求…摊牌，接受…的挑战
If you call someone's bluff, you tell them to do what they have been threatening to do, because you are sure that they will not really do it.
例句
The Socialists have decided to call the opposition's bluff.
社会党人已经决定接受对方的挑战。
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VERB
欺骗；误导；吓唬；虚张声势
If you bluff, you make someone believe that you will do something when you do not really intend to do it, or that you know something when you do not really know it.
例句
Either side, or both, could be bluffing...
任何一方，或者双方，都可能是在故弄玄虚。
In each case the hijackers bluffed the crew using fake grenades...
每一个案例中，劫机者都用了假手榴弹吓唬机组人员。
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N-COUNT
（尤指河边或海边的）悬崖，峭壁，陡岸
A bluff is a steep cliff or bank, especially by a river or the sea.
例句
...a high bluff over the Congaree River.
康加里河边高耸的峭壁
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ADJ-GRADED
坦率的；坦白的；直言的
If you describe someone, usually a man, as bluff, you mean that they have a very direct way of speaking and behaving.
例句
He comes across as a man with a bluff exterior who, beyond that, is difficult to get to know...
他给人感觉是一个直来直去的人，但内心却让人捉摸不透。
He has continued to write with a bluff, vivid humour about Yorkshire life.
他继续用一种直白而又诙谐生动的笔触描绘着约克郡的生活。