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Difference between Hit bottom and Hit the roof

hit bottom—(of prices, sales, etc.) reach the lowest or worst point (also: touch bottom):

  • Our profits have hit bottom. This is our worst year ever.

hit the roof —(also: go through the roof )

1. show extreme anger about smth.:

  • The Prime Minister and his cabinet would hit the roof if they knew half of the things that went on.

2. (of prices, sales, etc.) increase very rapidly; surpass the expected limit:

  • Once the summer season hits and tourism begins to rise, gas prices hit the roof.