backstabbing[noun]Synonyms: detraction, backbiting, belittlement, calumny, defamation, depreciation, disparagement, scandal, slander, tale
[TahlilGaran] English Synonym Dictionary ▲
back‧stab‧bing /ˈbækstæbɪŋ/
noun [uncountable] the act of secretly doing bad things to someone else, especially saying bad things about them, in order to gain an advantage for yourself
—backstabber noun [countable] [TahlilGaran] Dictionary of Contemporary English ▲