In this paper, I do several things. First, I present a definition of ‘corruption’ as ‘abuse of power that builds or maintains the abuser’s power’, arguing that this definition is more generally applicable than other definitions offered in the literature and that it highlights a crucial property of corruption, namely its tendency to metastasise, presenting a more and more serious danger to society. To defend the emphasis I place on this tendency, I then argue that corruption (as commonly understood) frequently produces three mechanisms pushing it to reproduce: self-perpetuation by the corrupt actors to protect themselves, formation of networks between corrupt actors which ensnare new participants, and normalisation of specific kinds of abuse...