The meaning of Rarifies

adjective

(of air, especially that at high altitudes) of lower pressure than usual; thin.

Usage examples:

Every ounce carried counts triple when you're trudging uphill in rarefied air

verb

Make or become less dense or solid.

Usage examples:

Air rarefies and degrounds the physical body

verb

To become less solid or dense; to make something do this

Usage examples:

The primordial cosmic soup is full of sound waves compressing and rarefying matter and light.