treadmill

Etymology

It is a compound from English tread + mill, the verb tread and the noun mill.^[2][3][4][5]

Earliest recorded meaning

A large revolving cylinder with steps on its surface, turned by people treading on them: 1822, in a title.^[2][6] Etymonline says the device was invented and named in 1822, as an instrument of prison discipline, and quotes a London description of that year of the tread mill invented by William Cubitt of Ipswich for the employment of prisoners.^[3]

Semantic evolution

The figurative sense, a monotonous or wearisome round of work, is recorded by 1827.^[3] The similar treadwheel, for driving machinery by the weight of a person or animal for purely mechanical purposes, is attested from the 1570s.^[3] Merriam-Webster also records mills worked by an animal treading an endless belt.^[6] In the 20th century the word passed to an exercise machine with a moving belt, first recorded in 1938 in the Washington Post,^[2] so that later generations came to see it as a way to fitness rather than a punishment.^[3] The verb, to labour on or as on a treadmill, appears in 1899.^[2][6]

Timeline

• 1822 – a cylinder with steps turned by people treading, used in prisons.^[2][3][6]
• 1827 – figurative, a monotonous round.^[3]
• 1899 – verb, to labour on or as on a treadmill.^[2]
• 1938 – an exercise machine with a continuous moving belt.^[2]

Meanings

Noun

1. An exercise machine with an endless moving belt on which a person walks or runs in one place.^[7][6][2]
2. A tiring or monotonous routine that seems to have no end: the daily treadmill of the office.^[7][8]
3. A mechanism turned by people treading on steps around the rim of a wide wheel, formerly used as a punishment in prisons.^[7][6][2]
4. A similar device worked by an animal treading an endless belt.^[6][8]

Verb

1. To labour on, or as if on, a treadmill.^[6][2]

Related words

• treadwheel
• tread
• mill

References

1. ^ Wiktionary, the free dictionary, https://en.wiktionary.org
2. ^ a b c d e f g h i j Oxford English Dictionary Online (accessed March 2026), Oxford: Oxford University Press
3. ^ a b c d e f g Harper, Douglas. Online Etymology Dictionary, https://www.etymonline.com
4. ^ Partridge, Eric (1966), Origins: A Short Etymological Dictionary of Modern English, 4th ed., London: Routledge & Kegan Paul
5. ^ Dictionary.com Unabridged (2016), based on the Random House Unabridged Dictionary, New York: Random House
6. ^ a b c d e f g h Merriam-Webster Unabridged Dictionary (2024), online ed., Springfield, Mass.: Merriam-Webster
7. ^ a b c Collins English Dictionary (2023), Glasgow: HarperCollins
8. ^ a b The American Heritage Dictionary of the English Language (1992), 3rd ed., Boston: Houghton Mifflin