The term 'Say with Assurance' can be broken down into two crossword solutions: AVER and CLAIM. AVER is a 4-letter word meaning to assert or declare with confidence. It is derived from the Latin verb 'averare, ' which means to make firm or confirm. On the other hand, CLAIM is a 5-letter word meaning to state as a fact or demand as a right. It is derived from the Old French verb 'clamer, ' which means to call out or proclaim. Together, these two words form the phrase 'Say with Assurance, ' which implies confidently declaring something as true.