the bottom falls out of something

the bottom falls out of the industry

The sales of a particular product, or in a particular industry, stop. The phrase is often accompanied by "if" or "when," and the type of market is usually specified before the word "industry." If the bottom ever truly falls out of the automotive industry, we could have another Great Depression ahead of us. The bottom fell out of the film-camera industry when digital cameras arrived on the scene.
See also: bottom, fall, industry, of, out

the bottom falls out of the market

The sales of a particular product, or in a particular market, stop. The phrase is often accompanied by "if" or "when," and the type of market is usually specified before the word "market." If the bottom falls out of the real estate market again, we could have another Great Depression ahead of us. The bottom fell out of the film-camera market when digital cameras arrived on the scene.
See also: bottom, fall, market, of, out
Farlex Dictionary of Idioms.

the bottom falls out of something

If the bottom falls out of a market or industry, people stop buying its products in as large quantities as they did before. But just as quickly, the bottom fell out of the American home video game market. Note: You can also say that the bottom drops out of a market or industry. By the late seventies the bottom dropped out of the steel industry and heavy industry in general.
See also: bottom, fall, of, out, something
Collins COBUILD Idioms Dictionary, 3rd ed.

the bottom falls (or drops) out of something

something fails or collapses totally.
See also: bottom, fall, of, out, something
Farlex Partner Idioms Dictionary
See also:
  • the bottom falls out of the industry
  • the bottom falls out of the market
  • the bottom drops out of the market
  • the bottom drops/falls out of the market
  • remember (someone or something) as (something)
  • remember as
  • always the bridesmaid
  • always the bridesmaid, never the bride
  • bride
  • bridesmaid