Definition of collapse verb from the Oxford Advanced American Dictionary

        

    collapse

     verb
    verb
    NAmE//kəˈlæps//
     
    Verb Forms present simple I / you / we / they collapse
     
    he / she / it collapses
     
    past simple collapsed
     
    -ing form collapsing
     
     
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    of building
  1. 1[intransitive] to fall down or fall in suddenly, often after breaking apart The roof collapsed under the weight of snow.
  2. of sick person
  3. 2 [intransitive] to fall down (and usually become unconscious), especially because you are very sick He collapsed in the street and died two hours later.
  4. relax
  5. 3[intransitive] (informal) to sit or lie down and relax, especially after working hard When I get home, I like to collapse on the sofa and listen to music.
  6. fail
  7. 4[intransitive] to fail suddenly or completely synonym break down Talks between management and unions have collapsed. All opposition to the plan has collapsed.
  8. of prices/currencies
  9. 5[intransitive] to decrease suddenly in amount or value Share prices collapsed after the news.
  10. fold
  11. 6[intransitive, transitive] collapse (something) to fold something into a shape that uses less space; to be able to be folded in this way synonym fold up The table collapses for easy storage.
  12. medical
  13. 7[intransitive, transitive] collapse (something) if a lung or blood vessel collapses or is collapsed, it falls in and becomes flat and empty
  14.  
    adjective collapsed buildings a collapsed investment bank a collapsed lung
See the Oxford Advanced Learner's Dictionary entry: collapse