Lashon Hara is any derogatory or damaging statement against an individual. In Hilchot Deot 7:5, Maimonides supplies a litmus test for determining whether something is or isn’t Lashon Hara: Anything which, if it would be publicized, would cause the subject physical or monetary damage, or would cause him anguish or fear, is Lashon Hara. More @Wikipedia
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