Definition of running mate noun from the Oxford Advanced Learner's Dictionary

 

running mate

 noun
noun
BrE
 
; NAmE
 
[usually singular](politics) Elections
 
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(in the US) a person who is chosen by the candidate in an election, especially that for president, to support them and to have the next highest political position if they win The presidential nominee was advised to choose a woman as a running mate. Wordfindercaucus, congress, the Electoral College, House of Representatives, nomination, president, primary, running mate, senate, swing state See related entries: Elections
See the Oxford Advanced American Dictionary entry: running mate