Definition of backbiting noun from the Oxford Advanced Learner's Dictionary

 

backbiting

 noun
noun
BrE BrE//ˈbækbaɪtɪŋ//
 
; NAmE NAmE//ˈbækbaɪtɪŋ//
 
[uncountable] Describing unpleasant traits
 
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unpleasant and unkind talk about somebody who is not present He was tired of all the backbiting and gossip in the office. See related entries: Describing unpleasant traits Word Origin Middle English: from back + bite.
See the Oxford Advanced American Dictionary entry: backbiting