Historical clue formulations

• Skill on display in the "Kill Bill" movies — 2018-08-09
• Means of self-defense — 2018-08-01
• A master of this really knows his chops — 2014-10-22
• Martial art — 2013-07-30
• Style of fighting — 2010-09-30
• Literally, "skill" — 1999-12-26
• Chinese for "skill" — 1998-06-06