To lower, as in condition in life, office, rank, etc., so as to cause pain or hurt feelings; to degrade, to depress, to humble, to humiliate.
To act in a manner below oneself; to debase oneself.
To remove a part, to detract from (a quality of excellence, authority etc.).
To take away (something from something else) in a way which leaves it lessened.
To detract from (something); to disparage, belittle.