The term 'bum out' is a slang phrase that means to be disheartened or discouraged. The two crossword solutions for this term are 'SADDEN' and 'DEPRESS, ' both of which mean to make someone feel unhappy or dispirited. Both words can be used to describe the same feeling, but 'SADDEN' is more often used to describe a temporary feeling of sadness, while 'DEPRESS' is more often used to describe a longer-term feeling of unhappiness.