The term 'A Thing of the Past' can be summarized by three crossword solutions: RELIC (5 letters), OVER (4 letters), and ENDED (5 letters). A RELIC is an object or custom that has survived from an earlier time, often associated with a particular culture or period. OVER implies that something has gone beyond its limits or has been completed. ENDED means that something has come to a conclusion or has been terminated. Together, these three words suggest that something is no longer relevant or in use, and is now just a memory of the past.