Historical clue formulations

• Turndown? — 2025-04-04
• Fold, in a way — 2017-02-10
• Turned-over part of a leaf — 2014-11-14
• Makeshift bookmark — 2013-08-19
• Turndown? — 2008-07-18
• Makeshift bookmark — 2008-03-26
• Place marker — 2006-01-08
• Turn of the page? — 2005-07-14
• Bookmark, perhaps — 2000-11-29