sub·ro·gate 
(sŭbrō-gāt′)
(sŭbrō-gāt′)tr.v. sub·ro·gat·ed, sub·ro·gat·ing, sub·ro·gates
To engage in the subrogation (of a person or entity).
[Middle English *subrogaten, from Latin subrogāre, subrogāt- : sub-, instead of; see SUB- + rogāre, to ask; see reg- in the Appendix of Indo-European roots.]