Historical clue formulations

• What a left parenthesis suggests in an emoticon — 2020-08-23
• :-( — 2011-08-12
• Glower — 2005-12-16
• Dirty look — 2004-12-02
• Displeased look — 2004-11-17
• Displeased look — 2003-09-15
• Displeased look — 2003-02-03
• Upside-down smile — 1998-04-09
• Show disapproval — 1998-01-11
• Show displeasure — 1995-04-06
• Lower — 1994-02-11