get (something) down
1. To be or become proficient at (doing) something. I know the music is difficult to play, so you just have to keep practicing until you get it down. After years of working in data entry, I've got Excel spreadsheets down.
2. To eat or drink something. I'm just going to get this burger down before I head out the door. Here, get this tea down. It will help your nerves. I don't know how I managed to get that medicine down, it tasted awful!
3. To commit something to writing; to write something down. Here, get my number down. You can call me anytime you like. I always try to get my dreams down as soon as I wake up, or else I forget them altogether.