Historical clue formulations

• Yellow, so to speak — 2020-09-01
• Chicken — 2017-02-14
• Chicken, so to speak — 2010-12-28
• Yellow — 2010-01-12
• Quaking in one's boots — 2007-03-20
• One way to run — 2006-02-05
• Yellow — 2005-07-01
• Chicken — 2003-01-07
• One way to run — 2000-02-10
• One way to run — 1998-06-14
• With knees knocking — 1997-10-13
• Phobic — 1994-01-31