Etymologically
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jam

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Pronunciation

  • IPA: /ˈd͡ʒæm/[1]

Etymology

It is of unknown origin,[2][3] perhaps imitative,[2][4] or symbolic.[5] Etymonline suggests a variant of Middle English cham, to bite on, gnash (see champ).[3] The fruit preserve is probably a special use of the verb, from crushing the fruit.[2][3][6][5]

Earliest recorded meaning

To stick or become wedged: 1706.[2][3][4] To press tightly is from 1719, in Defoe's Robinson Crusoe.[2][3]

Semantic evolution

The preserve is from 1730–36, in Bailey's dictionary,[2][7] and figuratively something good or sweet from 1871.[7] The noun, a tight squeeze, is from 1805–06,[7][3] the blocking of a machine's moving parts from 1890,[7] and a predicament or tight spot from 1914.[3] Radio interference is from 1914.[3][7] In jazz, a free improvised session is from 1929, and the verb from 1935, from African-American slang jam-up, music performance;[3] jam session is from 1933.[7][3] Jam-packed is from 1901.[3]

Timeline

  • 1706 – to become wedged.[2]
  • 1719 – to press tightly.[2]
  • c. 1736 – fruit preserve.[2][7]
  • 1890 – a machine jam.[7]
  • 1914 – a predicament; radio jamming.[3]
  • 1929 – a jazz session.[7]

Modern meaning

Verb

  1. To squeeze or pack tightly into a space.
  2. To become stuck so as to be unable to move.
  3. To block a place by crowding into it.
  4. To interfere with radio signals so they cannot be received.
  5. (informal) To improvise music with other musicians.

Noun

  1. A sweet spread made from fruit boiled with sugar; preserve.
  2. A crowded mass that blocks movement: a traffic jam.
  3. (informal) A difficult situation.
  4. An informal session of improvised music.

Word family

  • jammable
  • jammer
  • jammy
  • jamlike
  • jam-up
  • logjam
  • unjam
  • jam session
  • jam-packed
  • champ

References

  1. ^ Wiktionary, the free dictionary, https://en.wiktionary.org
  2. ^ a b c d e f g h i Barnhart, Robert K. (1988), The Barnhart Dictionary of Etymology
  3. ^ a b c d e f g h i j k l Harper, Douglas. Online Etymology Dictionary, https://www.etymonline.com
  4. ^ a b Merriam-Webster Unabridged Dictionary (2024), online ed., Springfield, Mass.: Merriam-Webster
  5. ^ a b Hoad, T. F., ed. (1986), The Concise Oxford Dictionary of English Etymology, Oxford: Clarendon Press
  6. ^ Cresswell, Julia (2021), Oxford Dictionary of Word Origins, 3rd ed., Oxford: Oxford University Press
  7. ^ a b c d e f g h i Simpson, J. A.; Weiner, E. S. C., eds. (1989), The Oxford English Dictionary, 2nd ed., Oxford: Clarendon Press