"Shutdown mode" refers to a state where something, like a device or system, is turned off or inactive. It means the regular operations or functions have stopped temporarily or permanently. Full definition
Unless Congress reaches an agreement by midnight on Monday (30 September), the U.S. government will go into shutdown mode and nonessential personnel at federal government institutions — that is, everyone not involved in animal care, patient care, national defense, or other functions deemed essential — will have an unplanned holiday. (sciencemag.org)
Any financial modeler ought to bear unusual stressors in mind; either modelling the extreme effects themselves, or (as I prefer) fail - safe shutdown modes. (greenbackd.com)
That's actually not true, the reason why we tend to be tired after we have a large meal of Thanksgiving is simply because of the amount of food that we're having we have what's called postprandial fatigue, which is basically after you've had a big meal your body goes into basically shutdown mode and sleep gets promoted. (businessinsider.com)