treadmill
UK: ˈtredmɪl | US: ˈtredmɪl
n. a device used for exercise, consisting of a continuous moving belt on which to walk or run
n. a monotonous or repetitive routine or activity
n. (historical) a mill powered by humans or animals treading steps on a rotating wheel
The word treadmill originated in the early 19th century, combining "tread" (the action of stepping) and "mill" (a machine). Initially, it described a penal or labor device where prisoners or animals walked on rotating steps to power machinery. By the 20th century, it evolved into the modern exercise machine, retaining the core idea of stepping motion but repurposed for fitness. The metaphorical sense of a "repetitive routine" emerged from the monotonous nature of its operation.
She runs on the treadmill for 30 minutes every morning.
His job felt like a treadmill of endless paperwork.
In the 1800s, treadmills were used as punishment in prisons.
The gym installed new treadmills with interactive screens.
Breaking free from the treadmill of daily chores was liberating.