Tā zhěngtiān wúsuǒ-shìshì, jiù zhīdào jiáoshégēn, shuō biérén xiánhuà.
She does nothing all day but gossip and talk about others behind their backs.
Tips
usage
嚼舌 is informal and slightly derogatory. It often appears in extended forms: 嚼舌根 or 嚼舌头. All three mean the same thing - to gossip or talk idly about others.