[{"role": "user", "content": "I'm trying to understand an idiomatic expression and I'm stuck on the phrase \"Tom bit his lip.\" Can you help me translate it into Italian?"}, {"role": "assistant", "content": "The phrase \"Tom bit his lip\" is an idiomatic expression that means Tom is trying to hold back his emotions or react to something without speaking. The correct translation into Italian is \"Tom si morse il labbro.\""}]