This is the 2841st most frequent German word.
tot
Dead.
Here, 'tot' is used as an adjective to describe the state of being dead.
Der Wächter sagte erschrocken: 'Sie ist tot!'
The guard said in shock: 'She is dead!'
In this sentence, 'tot' metaphorically communicates extreme exhaustion rather than literal death.
Nach der langen Wanderung fühlte ich mich völlig tot.
After the long hike, I felt completely exhausted.
'Tot' describes the non-functionality or inoperability of the device in this context.