have something off pat phrase
to know something so well that you can say it, perform it etc without thinking about it
By the end of the week, I had my part off pat.
Thesaurus: to know something or someonesynonym
Main entry: pat
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have/know sth off ˈpat idiom
(BrE) (NAmE have/know sth down ˈpat) to know sth perfectly so that you can repeat it at any time without having to think about it
•
He had all the answers off pat.
Useful english dictionary. 2012.