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.
Words nearby down cold, have
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.