gossip about (someone or something)
To speak about someone or something in a hurtful or spiteful manner. Those popular girls are always gossiping about someone in our class. Oh please, I know you're the one who gossiped about me and started those awful rumors!
gossip about someone or something
to talk maliciously about someone or something. Who are you gossiping about now? They are gossiping about what happened last weekend.