say it: pat
pat is a noun, verb, adjective and adverb meaning "the sound made by a gentle blow". It carries 7 recorded senses.
the sound made by a gentle blow
completely or perfectly
“he has the lesson pat”
“had the system down pat”
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for pat come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.