rust

Etymology

It is inherited from Middle English rust, inherited from Old English rūst,^[2][3][4] from Proto-Germanic *rustaz,^[5][6] the source also of rost, rost (German Rost), roest and rost.^[7][8][9] Barnhart and the OED derive it from the same Indo-European base as red, so that it originally referred to the colour of rust:^[8][10][11] Proto-Indo-European *reudh- (“red”).^[2][11] Etymonline and Klein reconstruct a suffixed form *reudh-s-to-.^[7][12] Outside Germanic the closest relatives are rùstas (“brownish”),^[7][6][13] and rōbīgō (“rust”), which the OED counts as further formations from that base.^[8][7] The verb is rusten, formed from the noun.^[7][14]

Earliest recorded meaning

The red coating that forms on iron: in early Old English glossaries, where rust translates Latin aerugo and rubigo.^[8][4] Barnhart dates the Old English word to about 725.^[9] Already in the time of King Alfred it meant, figuratively, moral corruption, as in the Old English Pastoral Care,^[8][4] and a disease of plants that discolours leaves and stems is also recorded in Old English.^[8]

Semantic evolution

The verb, of metals, to become rusty, is first recorded in the Ancrene Riwle (?c1225);^[8][7] its figurative sense, to deteriorate through idleness or lack of use, follows by the early 14th century,^[7][8] and the transitive use, to cause to rust, from 1587.^[8][7] The noun meant the effects of time or age from c1425, and in 16th-century Scots also bitter malice.^[8] As a colour word, rust gave the verb "to become rust-coloured" (?1529).^[8] Johnson (1755) defined rust as "the red desquamation of old iron", and also as loss of power through inactivity.^[15] Slang uses included rust for money (1857)^[8][16] and, from 1945, rust bucket for a decrepit ship or car.^[7][16] The Rust Belt, the declining industrial region of the central United States, dates from 1984.^[7] In northern English dialect rust was also a form of rest, and in Scotland, Ireland and much of England to rust could mean of a horse to be restive.^[17]

Timeline

• Old English – the coating formed on iron; moral corruption; a plant disease.^[8]
• ?c1225 – verb, to become rusty.^[8]
• a1400 – verb, to deteriorate through disuse.^[8]
• c1425 – the effects of time.^[8]
• 1587 – verb, to cause to rust.^[8]
• 1857 – slang, money.^[8][16]
• 1945 – rust bucket.^[7][16]
• 1984 – Rust Belt.^[7]

Modern meaning

Noun

1. A reddish-brown oxide that forms as a flaking coating on iron or steel through the action of oxygen and moisture: Rust had eaten through the hinges of the old gate.
2. A similar coating on another metal, or a stain resembling rust.
3. (plant pathology) A disease of plants, especially cereals, caused by fungi that produce reddish-brown spots; also, a fungus that causes it.
4. A reddish-brown or orange-brown colour.
5. Decline or impairment caused by inactivity or lack of use.

Verb

1. To become covered with rust; to corrode, or to cause metal to corrode.
2. To deteriorate or become less able through lack of use or idleness: Her French had rusted after years abroad.
3. To become or make rust-coloured.

Word family

• antirust
• rustless
• rustbucket
• rustproof
• rusty

Related words

• red
• ruddy
• russet
• rubella

References

1. ^ Wiktionary, the free dictionary, https://en.wiktionary.org
2. ^ a b The American Heritage Dictionary of the English Language (online 2024), 5th ed., Boston: Houghton Mifflin Harcourt
3. ^ Hoad, T. F., ed. (1986), The Concise Oxford Dictionary of English Etymology, Oxford: Clarendon Press
4. ^ a b c Bosworth, Joseph; Toller, T. Northcote (1898), An Anglo-Saxon Dictionary, Oxford: Clarendon Press; Toller, T. Northcote (1921), Supplement
5. ^ Köbler, Gerhard (2014), Germanisches Wörterbuch, 5th ed., online, koeblergerhard.de/wikiling
6. ^ a b Orel, Vladimir (2003), A Handbook of Germanic Etymology, Leiden / Boston: Brill
7. ^ a b c d e f g h i j k l Harper, Douglas. Online Etymology Dictionary, https://www.etymonline.com
8. ^ a b c d e f g h i j k l m n o p q r Oxford English Dictionary Online (accessed March 2026), Oxford: Oxford University Press
9. ^ a b Barnhart, Robert K., ed. (1995), The Barnhart Concise Dictionary of Etymology, New York: HarperCollins
10. ^ Barnhart, Robert K. (1988), The Barnhart Dictionary of Etymology
11. ^ a b Ayto, John (2005), Word Origins: The Secret Histories of English Words from A to Z, 2nd ed., London: A & C Black
12. ^ Klein, Ernest. A Comprehensive Etymological Dictionary of the English Language. 2 vols. Amsterdam: Elsevier, 1966–1967.
13. ^ Holthausen, Ferdinand (1934), Altenglisches etymologisches Wörterbuch, Heidelberg: Carl Winter
14. ^ Merriam-Webster Unabridged Dictionary (2024), online ed., Springfield, Mass.: Merriam-Webster
15. ^ Johnson, Samuel (1755), A Dictionary of the English Language, London; 4th ed. 1773; Johnson's Dictionary Online, ed. Beth Rapp Young et al.
16. ^ a b c d Green, Jonathon (2010), Green's Dictionary of Slang, London: Chambers; digital ed. 2016–, https://greensdictofslang.com
17. ^ Wright, Joseph, ed. (1898–1905), The English Dialect Dictionary, 6 vols., Oxford: Henry Frowde; via EDD Online 4.0, University of Innsbruck (CC BY 4.0)