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bad·mouthor bad-mouth (băd′mouth′, -mouth′)
tr.v. bad·mouthed, bad·mouth·ing, bad·mouths or bad-mouthed or bad-mouth·ing or bad-mouths Informal
To criticize or disparage, often spitefully or unfairly: "those cross-Atlantic aficionados who persistently idolize the British theater and bad-mouth Broadway" (Benedict Nightingale).
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
(tr) slang to speak unfavourably about
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
or bad′mouth`(ˈbædˌmaʊθ or, sometimes, -ˌmaʊð)
v.t. -mouthed, -mouth•ing.
to criticize, often disloyally.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
Past participle: bad-mouthed
Collins English Verb Tables © HarperCollins Publishers 2011
vt (inf) → herziehen über (+acc) (inf)
Collins German Dictionary – Complete and Unabridged 7th Edition 2005. © William Collins Sons & Co. Ltd. 1980 © HarperCollins Publishers 1991, 1997, 1999, 2004, 2005, 2007