lead with your chin
lead with your chinmainly BRITISH
If someone leads with their chin, they behave very aggressively, causing a fight or argument. We don't plan to attack the administration for not spending more on education. There's nothing to be gained from leading with our chins. Note: This expression comes from boxing, and refers to a boxer fighting with their chin sticking out, making it easy for their opponent to hit it.
lead with your chinbehave or speak incautiously. informal
This expression originated as mid 20th-century boxing slang, referring to a boxer's stance that leaves his chin unprotected.