The term 'get all gussied up' is an informal phrase that means to dress up in one's best clothes. The two crossword solutions for this term are 'PREEN' and 'dress to the nines'. PREEN is a verb meaning to groom oneself, usually by tidying one's hair or clothing. Dress to the nines is an idiom meaning to dress in one's finest clothes. Together, these two solutions suggest that to get all gussied up is to make sure one looks their best by grooming themselves and wearing their best clothes.