以防万一 Traditional 以防萬一 yǐ fáng wàn yī 🔊 to guard against the unexpected (idiom) + Keep this word Meanings yǐ fáng wàn yī 以防萬一 to guard against the unexpected (idiom); just in caseprepared for any eventualities Its characters 以yǐto useHSK 5防fángto protectHSK 5万wànten thousandHSK 2一yīoneHSK 1