What it means

1. verb collapse due to fatigue, an illness, or a sudden attack
2. verb make ineffective
   “Martin Luther King tried to break down racial discrimination”
3. verb cause to fall or collapse
4. verb lose control of one's emotions
   “When she heard that she had not passed the exam, she lost it completely”
5. verb separate (substances) into constituent elements or parts
6. verb make a mathematical, chemical, or grammatical analysis of
   “analyze a specimen”
7. verb fall apart
   “the building crumbled after the explosion”
8. verb stop operating or functioning
   “The engine finally went”