The term 'Puttin' on the Ritz' is a popular song written by Irving Berlin in 1929. The title of the song is often used as an idiom to describe someone who is dressing up and putting on a show. The crossword solution for this term is RITZ, which is a four-letter word. The Ritz is a luxury hotel chain that was founded in London in 1906 and has since expanded to many other countries. The phrase 'Puttin' on the Ritz' is often associated with the luxurious lifestyle of the Ritz hotels.