Etymology
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subrogate (v.)

"to substitute," 1530s, from Latin subrogatus, variant of surrogatus, past participle of subrogare/surrogare "put in another's place, substitute, cause to be chosen in place of another," from sub "in the place of, under" (see sub-) + rogare "to ask, propose," apparently a figurative use of a PIE verb meaning literally "to stretch out (the hand)," from root *reg- "move in a straight line" (compare surrogate). Related: Subrogated; subrogating.

updated on April 28, 2017

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Definitions of subrogate from WordNet

subrogate (v.)
substitute one creditor for another, as in the case where an insurance company sues the person who caused an accident for the insured;
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.