jam-up: Meaning and Definition of

jam-up

Pronunciation: ( jam'up"), [key]
— 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.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.