Historical clue formulations

• Take the top off of, in a way — 2013-08-21
• Show respect, in a way — 2010-03-12
• Take the top off — 2007-10-13
• Flip one's lid? — 2006-07-10
• Take off the topper — 1996-07-22
• Doff one's derby — 1996-01-26