become exhausted, all
殫 centers on complete depletion: becoming exhausted or using something up entirely. The sense of 'all' follows from the idea of total consumption.
殫 combines 歹 (death, decay) with 單, which likely contributes the sound and the idea of something being used up or exhausted.
The left side 歹 suggests decay or death, and the right side 單 looks like a container being emptied. Picture a container of life force being completely drained until nothing is left.
For タン, imagine a tanning bed that completely exhausts your energy: tan -> タン, and after using it you are totally depleted.