free fall

Pronunciation:			free fol
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WordNet Dictionary
	Definition:		[n]  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"; "when that became known the price of their stock went into free fall" [n]  the ideal falling motion of something subject only to a gravitational field
	Synonyms:		drop, fall
	See Also:		decrease, decrement, drop, fall, voltage drop