improvement of fortune; better luck
Refers to a change in one's luck for the better, often used in spiritual, superstitious, or self-help contexts.
I bought a charm hoping for better fortune.
He visits the shrine every day for a change in luck.
fraudulent business of selling goods by claiming they bring supernatural benefits
bringing luck and good fortune
Compound of 開 (kai, 'open') and 運 (un, 'luck/fortune'), literally meaning 'opening of fortune'. The exact historical derivation is uncertain, but the kanji composition suggests a shift toward better luck.