have (something) off pat(redirected from have that off pat)
have (something) off pat
To learn, master, or understand something perfectly, to the point of requiring little or no focus to do, recall, or accomplish it. I know it's a little tricky getting the hang of the machine, but keep at it, and you'll have it off pat in no time. My sister is such a musical prodigy that she can have a song off pat after listening to it only once or twice.