Faint means weak or not strong. The heart is considered the emotional organ so someone faint at heart would be emotionally weak.
The typical meaning of "pass out" is "to faint or lose consciousness." There are other meanings, depending on the context.
meaning a person without no mercy to others and a person that mercy to others.
"With a big heart" means one is sensitive to the needs of others.
"Put your heart into it" means to put as much effort as possible into something.
"Take heart" means to be courageous or hopeful, to think positively
The typical meaning of "pass out" is "to faint or lose consciousness." There are other meanings, depending on the context.
meaning a person without no mercy to others and a person that mercy to others.
The idiom "my heart was in my mouth" means feeling extremely anxious or nervous to the point where it feels like your heart is pounding heavily in your chest.
To want to have completed a goal.
"With a big heart" means one is sensitive to the needs of others.
"Put your heart into it" means to put as much effort as possible into something.
"Take heart" means to be courageous or hopeful, to think positively
you have broken somone's heart means to hurt someone feelings.
It is faint of heart not feint.
Unless there is truly something wrong with your heart, then yes, it is an idiom. My heart fell, my heart exploded, my heart sang, my heart doing anything other than pumping blood is an analogy and an idiom.
"To be" is not an idiom - it's a verb.
This is not an idiom. It means exactly what it says. The gladness he felt in the Spring left his heart. He was feeling sad.