Historical clue formulations

• Annoying knuckling — 2026-09-10
• Knuckled rub to the scalp — 2026-04-08
• Knuckle-headed gesture? — 2023-08-30
• What might accompany a headlock — 2023-07-07
• Knuckleheaded act? — 2021-01-27
• A real head-scratcher? — 2021-01-08
• Unpleasant accompanier of a headlock — 2018-05-29
• Knuckle-headed antic? — 2017-05-27
• Knuckle rub — 2016-03-21
• Knuckle to the head — 2015-07-29
• Painful bit of horseplay — 2015-04-28
• Result of knuckling down? — 2013-11-02
• Knuckle-headed action? — 2011-08-28
• Knuckle-head move? — 2011-05-11
• Playful knuckle-rub — 2008-07-07