What is the word for things that work even when they aren't working (e.g. escalators)?


I'm looking for a word (or phrase) to describe mechanisms that are perfectly functional even when they aren't functioning as expected.


Examples of these include:



  • Escalators & Electric Walkways: Even when they aren't powered these systems still function as perfectly adequate stairs or sidewalks

  • Mopeds: Even when out of gas, the owner can still pedal along

  • Electric Toothbrushes: One can still brush their teeth without turning it on


I've considered using engineering and management terms such as redundant mechanisms, enhanced systems, or fault-tolerant machines that come close, but those terms refer to very specific technical concepts that don't apply to my needs or the the examples.




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