Adulterate (6)

'adulterate' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for dilute that I've seen before include "Adulterate" , "Add water to another liquid" , "lost concentration" , "Make (a liquid) thinner" , "Reduce concentration of a liquid" .)
'adulterate' is the definition.
(synonyms)
This is all the clue.
(Other definitions for debase that I've seen before include "Lower in value or quality, sometimes currency" , "Humble" , "Lower the character of" , "Lower in quality, reduce the value of" , "dishonour" .)
'adulterate' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for taint that I've seen before include "Source of infection" , "Defect - contamination" , "Defile" , "black mark" , "Adulterate" .)