jam-up

[jam-uhp]
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noun
  1. 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
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018