I hear this a lot in song lyrics, and I just can't figure out what a "hot
chest" is supposed to mean.
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2017-07-10T01:38:59.710
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2017-07-10T11:57:29.140
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question
expressions
What is the meaning of the expression 熱い胸?
As for the definition 胸, it means chest is partially correct. To tell you the
truth, 胸 has various meanings besides chest.  
In my dictionary, 胸 is defined as:  
1. the chest, the breast, the bosom  
2. the breasts  
3. the heart, the lungs  
4. one's heart, one's mind  
In the case of 熱い胸, 胸 means neither some organ nor part of the body, but the
place where man's feeling is supposed to exist.

"熱い胸":  
Literally the phrase means _the hot heart_ , and it means _elevated emotions_.  
In the site shown by binom's comment, there is a sentence "胸が熱くなる", that is a
sentence closely corresponding to "熱い胸", which means "someone is moved by
something so they become in the state of elevated emotions."
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answer