"Cold feet" or "two left feet," e.g (5)

I believe the answer is:

idiom

(Other definitions for idiom that I've seen before include "Manner of speaking or writing" , "Language used by group, parlance" , "Language peculiar to a particular group" , "Saying specific to a certain language" , "Use of words" .)

I've seen this clue in the Universal.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.