To be extremely greedy; to pounce on an opportunity for gain like a fly spotting blood.
他一听说有免费的食物，立刻苍蝇见血般地冲了过去。
As soon as he heard there was free food, he rushed over like a fly spotting blood.
Next Idiom
To be extremely greedy; to pounce on an opportunity for gain like a fly spotting blood.