Historical clue formulations

• *Submit [Opposite of 27-Across?] — 2024-01-02
• Relent — 2022-08-23
• Say uncle — 2019-05-19
• Buckle — 2014-04-05
• Cry uncle — 2009-08-09
• Yield — 2005-05-29
• Knuckle under — 2001-05-10