The term 'START OF A CHEER' can be broken down into three crossword solutions: HIP (3 letters), SIS (3 letters), and VIVA (4 letters). HIP is an abbreviation for 'HIP, HIP, hooray, ' which is a traditional cheer used to express joy or approval. SIS is an abbreviation for 'siss-boom-bah, ' which is a cheer typically used to support a sports team. Finally, VIVA is an exclamation of enthusiasm or celebration, usually shouted in Spanish. All three of these terms are used to express excitement and enthusiasm, and are often used as the start of a cheer.