The term 'REMAIN FIRM' can be summarized by two crossword solutions: 'STANDPAT' (8 letters) and 'STICKTOONESGUNS' (15 letters). Both of these terms refer to the idea of staying firm in one's beliefs or decisions, even when faced with opposition. The term 'standpat' is derived from the phrase 'stand pat, ' which means to remain unchanged or unyielding. The term 'sticktoonesguns' is a combination of the words 'STICK' and 'GUNS, ' which implies that one should stay true to their convictions and not back down.