Meaning of うしろゆび in Japanese

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Definition of うしろゆび

うしろゆび(ushiroyubi) 【後ろ指 ·後指】

うしろゆびをさす(ushiroyubiwosasu) 【後ろ指を指す ·後指を指す】

(exp, v5s) to talk about someone behind their back; to backbite
後指を指すのはやめたまえ。
Don't talk about people behind their backs.

うしろゆびをさされる(ushiroyubiwosasareru) 【後ろ指を指される ·後ろ指をさされる】

(exp, v1) to be talked about behind one's back
後ろ指を指されるようなことなど、決してしていないよ。
I've never done the kind of thing people would talk about behind my back.