jam up

jam-up

[jam-uhp]
noun
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:
1940–45; noun use of verb phrase jam up

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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