Definitions of collapse:

• noun:   a mishap caused by something suddenly falling down or caving in
• noun:   an abrupt failure of function or health
• noun:   the act of throwing yourself down
• noun:   a sudden large decline of business or the prices of stocks (especially one that causes additional failures)
• verb:   fold or close up

  Example: "Collapse the music stand"

• verb:   lose significance, effectiveness, or value

  Example: "The stock market collapsed"

• verb:   break down, literally or metaphorically

  Example: "The wall collapsed"

• verb:   cause to burst
• verb:   collapse due to fatigue, an illness, or a sudden attack
• verb:   fall apart
• verb:   suffer a nervous breakdown