kompromat
noun [ U ] uk/ˈkɒm.prə.mæt/ us/ˈkɑːm.prə.mæt/
抹黑他人的材料，黑材料
information or reports that could damage someone's reputation
All the time I thought that he and I were friends, he was gathering kompromat on me. 我一直以为他和我是朋友，他却在收集我的黑材料。