Jam Jammed Sth Meaning Work Properly Moving Parts

Meaning: If something jams up, it can't work properly because one of its moving parts is jammed by something.

• jam up The lock on my suitcase has jammed up, so I can't open it.
  
  
• jam sth up Don't force the window or you'll jam it up and we won't be able to close it.
  
  
• be jammed up by sth Oh no! The printer has been jammed up by paper again.
  
  

Nouns often used as subjects with jam up: printer, fax machine, lock, door, window, gears