IPA: /ˈstiːpəlˌtʃeɪsər/
KK: /ˈstiplˌtʃeɪsər/
A person or horse that competes in a race called a steeplechase, which involves running over obstacles like fences and water jumps.
The steeplechaser jumped over the last hurdle to win the race.
Steeplechaser is formed from "steeple" (from Old English *stigpul*, meaning a tall structure or tower) and "chaser" (from the verb "chase", meaning to pursue). The word refers to a person who pursues a race that involves jumping over obstacles, often including steeples or similar structures.
Think of someone pursuing a race that involves jumping over tall structures like steeples — that's what a steeplechaser does.
No commonly confused words.