slam (on) the brake(s)

slam (on) the brake(s)

1. Literally, to quickly step on a vehicles brakes to slow down or stop. He slammed on the brakes when he saw the child running into the street. You risk doing your car serious damage if you slam the brake without shifting down the gears.
2. By extension, to slow down or stop something one is doing. We had to slam on the brakes when we found out investors were pulling out of the company.
See also: slam