Definitions for down pat
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Princeton's WordNet
down, down pat(p), mastered(adj)
understood perfectly
"had his algebra problems down"
Wiktionary
down pat(Adjective)
Thoroughly practiced, rehearsed, or understood.
Origin: Unknown, but possibly a use of pat (a light tap), in the sense of hitting the mark.
Citation
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"down pat." Definitions.net. STANDS4 LLC, 2013. Web. 21 May 2013. <http://www.definitions.net/definition/down pat>.