English Idioms and Idiomatic Expressions 

HEART - LUNGS

Idioms relating to the heart and the lungs  
from:  'change of heart'   to:  'at the top of one's lungs'

• (a) change of heart
  • If someone has a change of heart, they change their attitude or feelings, especially towards greater friendliness or coperation.
    "He was against charity, but he had a change of heart when he saw the plight of the homeless."
    
    
• (to your) heart's content
  • If you do something to your heart's content, you do it as much and for as long as you want.
    "When my parents are away, I can watch television to my heart's content!"
    
    
• (have your) heart in your mouth
  • A person who has their heart in their mouth feels extremely anxious or nervous faced with a dangerous or unpleasant situation.
    "Emma had her heart in her mouth when she saw her two-year-old son standing in front of the open window."
    
    
• (have your) heart in the right place
  • A person who has their heart in the right place has kind feelings and good intentions, even if the results are not too good.
    "The old lady's cake wasn't wonderful but she's got her heart in the right place!"
    
    
• (have your) heart set on something
  • Someone who has their heart set on something wants it very much.
    "From an early age Tiger had his heart set on becoming a professional golfer."
    
    
• (have a) heart of stone
  • Someone who has a heart of stone is a cold person who shows others no understanding, sympathy or pity.
    "She's not the person to go to if you've got problems - she's got a heart of stone!"
    
    
• (the) heart of the matter
  • The most important part or aspect of a situation is called the heart of the matter.
    "We need to get to the heart of the matter - what caused the accident?"
    
    
• (wear your) heart on sleeve
  • If you wear your heart on your sleeve, you allow others to see your emotions or feelings.
    "You could see she was hurt - she wears her heart on her sleeve."
    
    
• (someone's) heart misses a beat
  • If your heart misses (or skips) a beat, you have sudden feeling of fear or excitement.
    "When the lights suddenly went out, my heart missed a beat."
    
    
• (someone's) heart sinks
  • If your heart sinks, you feel very unhappy and despondent.
    "My heart sank when I saw the amount of work waiting for me."
    
    
• put your heart into something
  • If you put your heart (and soul) into something, you are very enthusiastic and invest a lot of energy and hard work in it.
    "Paul was determined to make a success of the project. He put his heart and soul into it."
    
    
• tug at the heartstrings
  • Something or someone who tugs at the heartstrings causes others to feel a great deal of pity or sadness.
    "The hospital's plea for donors tugged at the heartstrings of millions of viewers."
    
    

• air one's lungs
  • Someone who airs their lungs
    1) uses profane or vulgar language:
    "The boss sure aired his lungs when we lost another customer!"
    2) spends time chatting:
    "The girls get together once a week to have lunch and air their lungs."
    
    

• have a good pair of lungs
  • If someone has a good pair of lungs, they are able to shout or cry loudly.
    "The baby has a good pair of lungs, especially in the middle of the night ! "
    
    

• at the top of one's lungs
  • If you shout at the top of your lungs, you shout as loudly as you possibly can.
    "The place was so noisy that I had to shout at the top of my lungs to be heard."