Idioms  A - E    [A] [B] [C] [D] [E]

A
  A bad apple Be a piece of cake Be all ears
     
  Be the apple of someone's eye  
   
  Be as American as apple pie Be as blind as a bat
       
B
  Backfire Bark up the wrong tree Beat around the bush
   
  Beat it Bend over backward/backwards
   
  Bite off more than one can chew Bookworm
 
  The bottom line Be broke Bring the house down
   
  Bug someone Butterflies in someones' stomach
 
   
C  
  Can't make head nor tail (out) of something / someone Cast pearls before swine
 
  Catch someone's eye Be chicken Cold feet
 
  Cold turkey Cook someone's goose Be (as) cool as a cucumber
 
  Cool someone's heels Couch potato Be cut from the same cloth
       
D  
  Dear John letter Don't let the grass grow under your feet.
   
  Be down in the dumps Drive someone up the wall  
       
       
E
  Eat out Easy as pie Eat one's words