IPA: /ˈwiːlˌhɔːrs/
KK: /ˈwiːlˌhɔːrs/
A person who works hard for a specific cause, often without seeking praise or recognition.
She is the wheelhorse of the campaign, tirelessly working to ensure its success.
**Wheelhorse** → The word is formed from "wheel" (from Old English *hwēol*, meaning a circular object that revolves) and "horse" (from Old English *hors*, meaning a domesticated animal used for riding or labor). A wheelhorse originally referred to a horse that was used to pull a vehicle, particularly one that is essential for the movement of a wheel-based cart or wagon.
Think of a 'circular object' ('wheel') being pulled by a 'domesticated animal' ('horse') — this helps you remember that a wheelhorse is a horse used for pulling vehicles.
No commonly confused words.