死灰 sei² fui¹ {sǐ huī}

ashes; dying embers

死灰復燃〔--复-〕 sei² fui¹ fuk⁶ jin⁴ {sǐ huī fù rán}

1. lit. ashes burn once more (idiom); fig. sb lost returns to have influence
2. sth malevolent returns to haunt one