noun(in phrase go or be on the fritz) North American informal
(Of a machine) stop working properly.
- My cable modem at home is on the fritz, so there probably won't be any more blog posts until I get it fixed.
- It's not like an electrical grid is going to go on the fritz tomorrow and leave a corner of the country in the dark, right?
- Our electrical equipment went on the fritz and never came back.
early 20th century: said to be a use of Fritz, with allusion to cheap German imports into the US before World War I.
Entry from British & World English dictionary