The term 'look back' can be broken down into four crossword solutions: REMINISCE (9 letters), REVIEW (6 letters), RECALL (6 letters), and REMEMBER (8 letters). REMINISCE means to think fondly of past experiences or events, while REVIEW is the act of looking over something again. RECALL is the act of bringing back a memory or thought from the past, and REMEMBER is the act of retaining information in one's mind. All four words are related to the idea of looking back on the past.