debase

[1]	lower , degrade , pervert , subvert , devalue , depreciate , demoralize , demoralise , depress , demote , debauch , profane , deprecate , belittle , diminish , deprave , misdirect , reduce , disparage
[2]	adulterate , alloy , contaminate , taint , pollute , corrupt , mar , spoil , impair , vitiate , abase , defile , bastardize , poison
[3]	load , stretch , dilute