What is "sublimes"

Usage examples of "sublimes".

Stuff sublimes into vapor up there and the atmosphere transports it down toward the equator.

Formed from frozen air that sublimes under the lamp and freezes again as it spreads.

In that case, what might be happening here is that the fossil ice sublimes, gets redeposited in the caverns you’ve reached, and is at least partially replenished by water vapor percolating up through the soil beneath.