giâm-hông嚴防

to be strictly on guard against

to be strictly on guard against; to take strict precautions against

English Wiktionary, “嚴防” (CC BY-SA 4.0) — https://en.wiktionary.org/wiki/%E5%9A%B4%E9%98%B2 · confidence: Medium (Wiktionary, Hokkien)