wheelhorse

noun
wheel·​horse | \ ˈhwēl-ˌhȯrs How to pronounce wheelhorse (audio) , 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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not constant or steady

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