Definition from Wiktionary, the free dictionary
- (transitive) To lower in character, quality, or value; to degrade.
- (transitive, archaic) To lower in position or rank.
- (transitive) To lower the value of (a currency) by reducing the amount of valuable metal in the coins.
Derived terms 
lower in character, etc
- ^ Oxford English Dictionary, 2nd ed., 1989.