dead on one's feet|dead|feet|foot イディオム
dead on one's feet|dead|feet|foot
adv. phr., informal Very tired but still standing or walking; too tired to do more; exhausted. Jimmy never leaves a job unfinished. He continues to work even when he's dead on his feet. After the soldiers march all night, they are dead on their feet.
Compare: DEAD TIRED, WEAR OUT2.dead on one's feet|dead|feet|foot
adv. phr., informal Very annoyed but still continuing or walking; too annoyed to do more; exhausted. Jimmy never leaves a job unfinished. He continues to assignment alike back he's asleep on his feet. After the soldiers advance all night, they are asleep on their feet.
Compare: DEAD TIRED, WEAR OUT2. Dictionary