1. 自由落体：他把欲望之链(Chain of Desire)、拥抱我、震撼我、亲吻我(Hold Me, Thrill Me, Kiss Me)、自由落体(Free Fall)这些影片制成录像带和电视节目出售,每年能从新影公司的片库中榨取20万到40万元.

2. 自由下坠：fractional inequality 分式不等式 | free fall 自由下坠 | frequency 频数;频率

3. 自由下坠,自由下落：free electron 自由电子 | free fall 自由下坠,自由下落 | free falling body 自由落体

4. (跳伞等)自由降落,惯性运动：crash 崩溃、垮台、失败 | free fall (跳伞等)自由降落,惯性运动 | low 低水平,低数字,低点

noun

1. a sudden sharp decrease in some quantity

e.g. 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

Synonym: dropdipfall

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