down cold

English Language Tests, Intermediate level

ESL/EFL Test #476 [color=blue]“English Slang Idioms (218)”, question 3

“I have researched and memorized the steps to build a shed and now I have the process down ,” Nate said to Max.

(a) warm
(b) slap
(c) writ
(d) cold

English Language Tests, Intermediate level

ESL/EFL Test #476 [color=blue]“English Slang Idioms (218)”, answer 3

“I have researched and memorized the steps to build a shed and now I have the process down cold,” Nate said to Max.

Correct answer: (d) cold

Your answer was: [color=red]incorrect
“I have researched and memorized the steps to build a shed and now I have the process down writ,” Nate said to Max.
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Hi! Would you plese explain the meaning of " have the process down cold"? Thank you in advance!

‘Have…down cold’ = understand / know how to perform perfectly.