Longman Dictionary of Contemporary English homepage

pat

4 adverb
     
pat4
1

have something off pat

British English have something down pat American English to know something thoroughly so that you can say it, perform it etc immediately without thinking about it [↪ off by heart]
2

stand pat

American English to refuse to change your opinion or decision
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.
 
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