get tongues (a-)wagging

To be a source of gossip or idle speculation among a group of people. A few people in the office saw the boss get into a car with some lady who was definitely not his wife. That's sure to get tongues wagging! Just when the dust of his previous scandal had begun to settle, the governor did something new to get tongues a-wagging again across the country. All publicity is good publicity, right? So who cares if I get tongues a-wagging in this glitzy minidress?