Atrophy (verb)

1. To waste away; to shrink; to decrease in size or effectiveness.
2. To cause to waste away; to cause to shrink.

Origin:

The word "atrophy" is derived from the greek words "a-" meaning "not" and "trophe" meaning "nourishment", it came into the english language in the late 16th century.

Examples:

1. His muscles atrophied from lack of use.
2. The nerve cells in her brain had atrophied due to the disease.
3. The company's profits have atrophied over the past few years.
4. His writing skills atrophied from not practicing enough.
5. The business atrophied due to lack of investment.