ka-kiông加強

to strengthen

to strengthen; to reinforce; to improve; to increase; to fortify (to add spirits to wine to increase the alcohol content)

English Wiktionary, “加強” (CC BY-SA 4.0) — https://en.wiktionary.org/wiki/%E5%8A%A0%E5%BC%B7 · confidence: Medium (Wiktionary, Hokkien)