have (something) down cold

down cold

Learned, mastered, or understood perfectly, to the point of requiring little or no focus to do, recall, or accomplish. Make sure you practice these equations until you have them down cold. I always get my routine down cold so there won't be any room for error during the performance.
See also: cold, down

have (something) down cold

To learn, master, or understand something perfectly, to the point of requiring little or no focus to do, recall, or accomplish it. Make sure you practice these equations until you have them down cold. I always get my routine down cold so there won't be any room for error during the performance.
See also: cold, down, have
Farlex Dictionary of Idioms.

down cold, have

Learn or accomplish perfectly. For example, I have this song down cold. The slangy use of cold for "completely" dates from the late 1800s and the phrase itself from about 1900.
See also: down, have
The American Heritage® Dictionary of Idioms by Christine Ammer.
See also:
  • down cold
  • down pat
  • down to a fine art
  • group
  • a committee is a group of men who keep minutes and waste hours
  • be able to (do something) in (one's) sleep
  • be able to do something in your sleep
  • do (something) blindfolded
  • do blindfolded
  • could (do something) with one hand tied behind (one's) back