Question

break
  down

Accepted Answer

to use
  force on (a door etc)to cause it to open, sometimes resulting in breaking it:
  we had to break the door down because we lost the key. 2 to stop working
  properly: My car has broken down. 3 to fail; to be unsuccessful and so come
  to an end: The talks have broken down. 4 to be overcome withemotion: She
  broke down and wept. 5to divide into parts: The results can be broken down in
  several ways. The chemist has broken the compund down into its parts.

Broken Break Door Force Etc)to Open Resulting Breaking