Topic: AIR
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free fall , free-fall [singular, uncountable]
1TTA the movement of someone or something through the air without engine power, for example before a parachute opens after someone has jumped out of a plane
2 a very fast and uncontrolled fall in the value of something : 
the free-fall in housing prices
the free-fall in housing prices in/into free fall The economy is in free fall.
The economy is in free fall. —free-falling adjective
