Lead with (one's) chin phrase
To come near to an opponent with your chin protruding, enabling them to hit you more easily.
I was able to knock him down because he got too cocky, leading with his chin several times during the fight.
As soon as the fight started, he led with his chin and got knocked down immediately afterward.
To act or say something aggressively and without thinking carefully about the results.
She led with her chin on overthrowing the government.
I can't bear you leading with your chin anymore!
The verb "lead" must be conjugated according to its tense.
This expression originated as mid 20th-century boxing slang, referring to a boxer's stance that leaves his chin unprotected.
To punish someone or something harshly
He's a really strict teacher, so he'll definitely lower the boom on you if you don't do your homework.