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unleash

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Etymology and origin of the English word unleash

Confidence
Established
Formation
Derivation
First attested
1671 E. Phillips, New World of Words
Ultimate origin
Latin laxus
Etymology tree
inherited borrowed derived
English leash
English unleash

Pronunciation

Etymology

It is formed from English un- + leash,[2][3][4][5] with the prefix in its sense of reversing an action, attached to the verb leash, to tie with a leash, which is recorded from the 1590s.[3][2] The noun leash, a thong for holding a dog, is recorded from about 1300 and is from Old French lesse or laisse (“hound's leash”),[3][6][7][2] which Hoad and Barnhart take from laissier (“to let go, loosen”), from the slack lead on which a dog was let run,[6][7] from Latin laxō (“to loosen”), from laxus (“loose”), the source of lax.[7][3]

Earliest recorded meaning

In hunting, to free a dog from its leash, especially so that it can chase or attack: 1671, in E. Phillips's New World of Words,[2][3] about 1671 according to Merriam-Webster.[4] Dictionary.com dates it to 1665–75.[5]

Semantic evolution

The figurative use was present from the beginning.[2] From 1822, in Shelley's Hellas, the verb was used for letting loose a powerful or violent force, or giving free rein to an emotion.[2] This broad sense, freeing something from restraint or control, is now the main one.[8][4]

Timeline

  • c. 1300 – the noun leash.[3]
  • 1590s – the verb leash.[3]
  • 1671 – to free a hound from its leash.[2][3]
  • 1822 – to let loose a powerful force or an emotion.[2]

Meanings

Verb

  1. To release a dog or other animal from a leash.[8][4][2]
  2. To let loose a powerful or destructive force; to free from restraint or control: The dam failure unleashed a flood on the valley.[8][4][2]
  3. To give free rein to an emotion or effort: He unleashed his frustration on the referee.[2][8]

References

  1. ^ Wiktionary, the free dictionary, https://en.wiktionary.org
  2. ^ a b c d e f g h i j k Oxford English Dictionary Online (accessed March 2026), Oxford: Oxford University Press
  3. ^ a b c d e f g h Harper, Douglas. Online Etymology Dictionary, https://www.etymonline.com
  4. ^ a b c d e Merriam-Webster Unabridged Dictionary (2024), online ed., Springfield, Mass.: Merriam-Webster
  5. ^ a b Dictionary.com Unabridged (2016), based on the Random House Unabridged Dictionary, New York: Random House
  6. ^ a b Hoad, T. F., ed. (1986), The Concise Oxford Dictionary of English Etymology, Oxford: Clarendon Press
  7. ^ a b c Barnhart, Robert K. (1988), The Barnhart Dictionary of Etymology
  8. ^ a b c d Collins English Dictionary (2023), Glasgow: HarperCollins

Related etymologies

Cite this entry

“Unleash.” Etymologically, 31 Oct. 2026, etymologically.com/en/unleash. Accessed 31 Oct. 2026.

Last edited on . ·