free fall

Noun	1.	free fall - the ideal falling motion of something subject only to a gravitational field
	2.	free fall - 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" Synonyms: drop, dip, fall

drop, fall