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.