Pour out (one's) heart (to someone) phrase
To express one's deepest sentiments, thoughts, or secrets to someone else, particularly profusely or suddenly.
When I approached a student sitting on the pavement and asked what happened to him, he suddenly began to cry and poured his heart out to me.
After pouring her heart out to me about how she had become enamored with me, a flush of embarrassment rose to her cheeks.
It was my conscience that told me to pour my heart out to my mom about my wrongdoing.
The verb "pour" must be conjugated according to its tense.
The origin of this phrase is not clear.
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.