The Oxford Thesaurus An A-Z Dictionary of Synonyms - debasev.

1) lower, degrade, devalue, depreciate, depress, demote, deprecate, belittle, diminish, reduce, disparage: Words which denote fine qualities are in time debased. 2) adulterate, contaminate, taint, pollute, corrupt, mar, spoil, impair, vitiate, abase, defile, bastardize; poison: To increase profits, the manufacturer has debased the traditional formula.