Etymology
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rundown (n.)

by 1908 in baseball, "the action of defenders attempting to tag out a runner caught between bases," from the verbal phrase; see run (v.) + down (adv.). To run down in hunting as "to chase until caught or killed" is by 1660s.

The meaning "list of entries in a horse race and the odds" is from 1935; hence the generalized slang sense of "summary, account, list of information or facts," attested from 1945. Compare run-down (adj.).

updated on October 22, 2021

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Definitions of rundown from WordNet

rundown (n.)
a concluding summary (as in presenting a case before a law court);
Synonyms: summation / summing up
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.