I thought she was acting foolishly, but I 'bit my tongue' [='held my tongue'] and didn't say anything.
The news of their engagement 'set tongues wagging'. = 'Tongues were wagging' over their engagement.
He speaks English fluently but his 'mother tongue' [='native language, first language'] is Chinese.
(..) lives here in France. Do you trust this man? I hope you can. Vernet, Andr'. It seems you're not a driver at all. Apparently, you lost your tongue along with your truck. Aiding and abetting two murder suspects. That carries jail time. Speak to my lawyer. (..)2006 The Da Vinci Code