to plunder, to rob openly
刼 centers on taking by force in a public or blatant way: plundering or robbing openly, without concealment.
刼 is a variant form of 劫, combining 去 (go away) with 刃 (blade) to suggest taking by force. The exact historical development is uncertain, but it likely expresses plundering with a weapon.
The left side 去 means 'go away', and the right side 刃 is a blade. Picture someone going away with goods at blade-point: open robbery.
For キョウ, imagine a robber shouting 'KYOU!' as they plunder openly: the invented sound 'kyou' cues キョウ while the blade enforces the theft.
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