verb

1. To reduce in size, force, value, amount, or degree.

2. To make thinner, as by physically reshaping, starving, or decaying.

3. To become thin or fine; to grow less.

4. To weaken.

5. To rarefy.

6. To reduce the virulence of a bacterium or virus.

7. To reduce the amplitude of an electrical, radio, or optical signal.

8. (of a beer) To become less dense as a result of the conversion of sugar to alcohol.