Abuse, disparage (6)
I believe the answer is:
vilify
I believe this is a double definition.
'abuse' is the first definition.
(I know that vilify is a more specific form of the action abuse)
'disparage' is the second definition.
(I've seen this before)
(Other definitions for vilify that I've seen before include "Abusively disparage" , "Abuse - defame" , "Spread negative information about" , "rubbish" , "Malign or defame" .)