Longman Dictionary of Contemporary English:
Collapse (verb)
1▶STRUCTURE◀
[intransitive] if a building, wall etc collapses, it falls down suddenly, usually because it is weak or damaged
Uncle Ted's chair collapsed under his weight. The roof had collapsed long ago.
2▶ILLNESS/INJURY◀
[intransitive] to suddenly fall down or become unconscious because you are ill or weak
He collapsed with a heart attack while he was dancing. Marion's legs collapsed under her.3▶FAIL◀
[intransitive] if a system, idea, or organization collapses, it suddenly fails or becomes too weak to continue
The luxury car market has collapsed. I thought that without me the whole project would collapse.
4▶PRICES◀
[intransitive] if prices, levels, etc collapse, they suddenly become much lower
There were fears that property prices would collapse.
5▶SIT/LIE◀
[intransitive] to suddenly sit down, especially because you are very tired or want to relax
I was so exhausted when I got home, I just collapsed on the sofa.
6▶FOLD SOMETHING SMALLER◀
[intransitive and transitive] if a piece of furniture or equipment collapses, or if you collapse it, you can fold it so that it becomes smaller
The legs on our card table collapse so we can store it in the closet.
7▶MEDICAL◀
[intransitive] if a lung or a blood vessel collapses, it suddenly becomes flat, so that it no longer has any air or blood in it
Eli pyöreesti voi olla mitä vaan oikeista sydänvaivoista, kovan krapulan aiheuttamaan heikostustilaan, joka nousee pontenssiin ihmisen yrittäessä kuntoilla siinä leksassa.
