Longman Dictionary of Contemporary English homepage

slag

2 verb
     
slag2 past tense and past participle slagged, present participle slagging

slag somebody ↔ off

phrasal verb
to criticize someone in an unpleasant way, especially when this is unfair:
He's always slagging her off behind her back.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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