[lawg-jam, log-]
See more synonyms for logjam on Thesaurus.com
  1. an immovable pileup or tangle of logs, as in a river, causing a blockage.
  2. any blockage or massive accumulation: a logjam of bills before Congress.

Origin of logjam

First recorded in 1880–85; log1 + jam1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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Word Origin and History for logjam

also log-jam, "congestion of logs on a river," by 1851, American English; see log (n.1) + jam (v.). The figurative sense is by 1890.

Online Etymology Dictionary, © 2010 Douglas Harper