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[jam-uhp] /ˈdʒæmˌʌp/
a stoppage or slowing of motion, work, or the like, due to obstruction, overloading, malfunction, or inefficiency; jam:
Your letters didn't go out yesterday because there was a jam-up in the mail room.
Origin of jam-up
First recorded in 1940-45; noun use of verb phrase jam up Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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jam up

verb phrase

To encumber; disable by overburdening: to file complaints was a sure way to jam up a cop (1940s+)



A tight crush of people, cars, etc, preventing normal movement; jam: to forestall the possibility of another jam-up (1940s+)

The Dictionary of American Slang, Fourth Edition by Barbara Ann Kipfer, PhD. and Robert L. Chapman, Ph.D.
Copyright (C) 2007 by HarperCollins Publishers.
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