The image is of a heavy weight on your heart (which is inside your chest) - you are getting rid of that weight by telling someone why you are unhappy. This idiom means to share your feelings and thus "clear the air" of suppressed emotion.
To tell someone something that has been bothering you.
A worry or anger seems to sit on your chest and make you feel heavy. When you tell someone how you really feel, you're getting it off your chest.
An idiom is something that does not mean what the phrase says literally, so yes. You can't actually laugh your head off.
Ripped off means you had something stolen. You were robbed.
I'm not sure about 'pounding out of my chest' but'my heart was jumping out of my chest''my heart was pounding'are idioms.
you was close to something,you almost got it
A worry or anger seems to sit on your chest and make you feel heavy. When you tell someone how you really feel, you're getting it off your chest.
An idiom is something that does not mean what the phrase says literally, so yes. You can't actually laugh your head off.
Ripped off means you had something stolen. You were robbed.
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.
you was close to something,you almost got it
I'm not sure about 'pounding out of my chest' but'my heart was jumping out of my chest''my heart was pounding'are idioms.
Talking excessively, usually spilling secrets.
It means to fall asleep while sitting (or standing).
Old sailing slang meaning to be no longer in danger.
Nothing. The correct idiom is "get OFF your high horse," meaning stop acting so conceited as if you are above everyone else.
You are alot like you mother/father/brother/sister.
You know how your chest feels tight when you are emotional? Getting something off your chest means to share your feelings so that you don't feel so bad any more.