為虎作倀 (wai6 fu2 zok3 coeng1) — act as an evil spirit to a tiger in Cantonese
waiˍ₆為fuˊ²虎zok˗₃作coengˉ¹倀简 为虎作伥
Mandarin Pinyin: wei4 hu3 zuo4 chang1
Meaning of 為虎作倀
nounact as an evil spirit to a tiger
nounhold a candle to the devil; help a villain do evil