Down to a science

If you have something “down to a science,” you have learned and practiced it very well, almost perfectly. It suggests that you have become very efficient and organized after careful planning and lots of practice.

For example, if you have cooking Christmas dinner down to a science, it means you are really good at cooking that meal for a lot of people, and everything goes smoothly when you’re in charge of dinner. It’s like saying you’ve figured out the best way to do it.

Some cities get a lot of snow, and they have snow removal down to a science. That means, they’ve gotten a lot of practice clearing snow, so six inches doesn’t bother them at all.