The word "颠覆" (diānfù) means "to overturn" or "to subvert" in English. It is often used to describe the act of overthrowing or overturning established norms, systems, beliefs, or authority. Here are some examples: 

他的言论颠覆了我们的认知。 (Tā de yánlùn diānfù le wǒmen de rènzhī.) - His remarks subverted our understanding. 

这项发现颠覆了科学界的常识。 (Zhè xiàng fāxiàn diānfù le kēxuéjiè de chángshí.) - This discovery overturns the common knowledge in the scientific community.