1.(pretence)虚张声势；恐吓
The letter was a bluff.这是一封恐吓信。
It is essential to build up the military option and show that this is not a bluff.重要的是, 要提高军事打击的可能性, 并表明这并非虚张声势。
2.(cliff)悬崖；峭壁；陡岸
a high bluff over the Congaree River康加里河上的一处悬崖峭壁
3.<加拿大>(copse)灌木丛；矮树林
4.to call sb's bluff
(challenge)接受某人的挑战；让某人做其威胁要做的事(因为确信对方不会真的那么做)
The Socialists have decided to call the opposition's bluff.社会党人决定接受反对党的挑战。
Friends say I should call her bluff and agree to separate.朋友们说我应该就按她所威胁的那样, 同意分居。