the ideal falling motion of something subject only to a gravitational field
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"
free fall的用法和样例：
例句
For large, extended chords thrust is preferable to free fall. 用推力动作弹奏伸展的大和弦优于自由下落动作。
It was observed that, with a wider orifice, kinematic arching effect vanishes and even free gravity-fall arises. 在大出口情况，结拱不易形成，并出现颗粒自由下落现象。
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