Speak unfavorably about.
synonyms: badmouth, drag through the mud, malign.
Roget 934:
detract,
derogate,
decry,
deprecate,
depreciate,
disparage;
run down,
cry down;
backcap [U.S.];
belittle;
sneer at
etc.
(contempt)
930;
criticize,
pull to pieces,
pick a hole in one's coat,
asperse,
cast aspersions,
blow upon,
bespatter,
blacken,
vilify,
vilipend†;
avile†;
give a dog a bad name,
brand,
malign;
muckrake;
backbite,
libel,
lampoon,
traduce,
slander,
defame,
calumniate,
bear false witness against;
speak ill of behind one's back.
fling dirt
etc.
(disrespect)
929;
anathematize
etc.
932;
dip the pen in gall,
view in a bad light.
impugn
(disparage the motives of);
assail,
attack
etc.
716;
oppose
etc.
708;
denounce,
accuse
etc.
938.
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Dutch: lasteren, kwaadspreken