WordReference Random House Unabridged Dictionary of American English © 2020
jam-up  ( jamup′),USA pronunciation n. 
  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.
n. use of v. phrase jam up]


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