Reduce

Verb

1. To bring down the size, quantity, quality, value or intensity of something; to diminish, to lower.

   "to reduce weight, speed, heat, expenses, price, personnel etc."

2. To lose weight.
3. To bring to an inferior rank; to degrade, to demote.

   "to reduce a sergeant to the ranks"

4. To humble; to conquer; to subdue; to capture.

   "to reduce a province or a fort"

5. To bring to an inferior state or condition.

   "to reduce a city to ashes"