Historical clue formulations

• Classic breakup excuse … or a phonetic hint to 23-, 36-, 47-, 67-, 86- and 93-Across — 2025-03-23
• Fault line — 2014-07-27
• Breakup line from a grammarian? — 2006-10-04
• Narcissist's breakup line? — 2004-09-08