Collapse is a verb meaning to fall down or give way suddenly, often after breaking apart.
In medical terms, collapse refers to a sudden failure of function, such as a lung collapse.
The word "collapse" can also mean:
1. To fold down into a more compact form (like a collapsible chair)
2. A sudden failure of an organization or system (economic collapse)
3. To lose strength or energy suddenly (I collapsed from exhaustion)