free fall

Noun

• a sudden sharp decrease in some quantity
  • a drop of 57 points on the Dow Jones index
    
  • there was a drop in pressure in the pulmonary artery
    
  • a dip in prices
    
  • when that became known the price of their stock went into free fall
    

• the ideal falling motion of something subject only to a gravitational field

Related words

• Synonyms: 
  drop , dip , fall