辟 is thought to combine 辛 (a tool or punishment) with a kneeling person, suggesting a person receiving punishment or correction. The exact historical development is uncertain.
Meaning mnemonic
The right side 辛 looks like a sharp tool or punishment, and the left side resembles a person kneeling. Imagine a criminal kneeling before the law, receiving punishment for a false act.
Reading mnemonic
For ヘキ, picture a criminal being punished by being forced to stand in a corner, like a hockey penalty box: hockey -> ヘキ, and the punishment fits the crime.
