abuse

sense 1: treat badly; "This boss abuses his workers"
mistreat maltreat abuse ill-use ill-treat

sense 2: change the inherent purpose or function of something; "Don't abuse the system"; "The director of the factory misused the funds intended for the health care of his workers"
pervert misuse abuse

sense 3: use foul or abusive language towards; "The actress abused the policeman who gave her a parking ticket"; "The angry mother shouted at the teacher"
abuse clapperclaw blackguard shout