free fall

Noun free fall has 2 senses

• free fall(n = noun.event) - the ideal falling motion of something subject only to a gravitational field;
is a kind of drop, fall

• free fall(n = noun.attribute) dip, drop, 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"
is a kind of decrease, decrement
has particulars: correction, voltage drop