wheelhorse

noun
wheel·horse | \ ˈhwēl-ˌhȯrs , ˈwēl- \

Definition of wheelhorse 

1 : a horse (as in a tandem) in a position nearest the wheels

2 : a steady and effective worker especially in a political body

First Known Use of wheelhorse

1708, in the meaning defined at sense 1

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The first known use of wheelhorse was in 1708

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