The term 'DEBASE ONESELF' can be broken down into two crossword solutions: ADULTERATE (10 letters) and GROVEL (6 letters). ADULTERATE means to make something impure or inferior by adding something of lesser value. GROVEL means to act in an abjectly servile manner. Together, these two words describe the act of debasing oneself, which is to lower one's own dignity or self-respect through servile behavior or by compromising one's principles.