[{"role": "user", "content": "I'm trying to learn some Italian phrases for my upcoming trip, and I'd like to know how to tell a friend to stop complaining - how do I say 'Stop grumbling' in Italian?"}, {"role": "assistant", "content": "In Italian, you can say 'Smettila di lamentarti' to tell a friend to stop grumbling or complaining. This is a informal way to express this, so it's perfect to use with friends."}]