Meaning of “have/know sth off pat” in the English Dictionary

british dictionary

"have/know sth off pat" in British English

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have/know sth off pat

UK US have/know sth down pat

to know something so well that you can say or do it without having to try or think:

I'd given the talk so many times I had it off pat.

(Definition of “have/know sth off pat” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)