dead on one's feet

dead on (one's) feet

1. Near to the point of collapse or losing consciousness (as due to exhaustion or injury) while still remaining on one's feet; just short of being asleep or unconscious. Doctors in training are expected to endure an unbelievable amount of stress and exhaustion. Surely it is counterproductive forcing them to attend to each of their patients while they're dead on their feet.
2. Still functioning, but past the point of usefulness or productivity; All but or as good as defeated. The company has managed to remain open, but, truth be told, it's really been dead on its feet for the last year.
See also: dead, feet, on

dead wrong

Completely wrong. If you think I'm doing your chores for you, you're dead wrong, buddy! Well, based on these results, my hypothesis is dead wrong.
See also: dead, wrong
Farlex Dictionary of Idioms.

dead wrong

completely wrong. I'm sorry. I was dead wrong. I didn't have the facts straight.
See also: dead, wrong
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs.

dead on one's feet

Also, dead tired. Extremely weary, as in Mom was in the kitchen all day and was dead on her feet, or I'd love to go, but I'm dead tired. The use of dead for "tired to exhaustion" dates from the early 1800s, and dead on one's feet, conjuring up the image of a dead person still standing up, dates from the late 1800s.
See also: dead, feet, on
The American Heritage® Dictionary of Idioms by Christine Ammer.

dead on one's feet

Extremely tired. This graphic hyperbole, with its use of “dead” in the meaning of “utterly fatigued,” is probably related to dead tired, where “dead” means “very” or “absolutely.” This locution has been traced to Irish speech and appears in such clichés as dead wrong for “completely mistaken,” dead right for “absolutely correct,” dead certain for “totally sure,” and others. “Dead on one’s feet” became common in the mid-twentieth century. John Braine used it in Life at the Top (1962): “Honestly, I’m dead on my feet.”
See also: dead, feet, on
The Dictionary of Clichés by Christine Ammer
See also:
  • dead on (one's) feet
  • dead on feet
  • dead on your feet
  • out on (one's) feet
  • be dead on (one's) feet
  • be out on (one's) feet
  • be in the Land of Nod
  • in the Land of Nod
  • catch flies
  • force of habit