a bottle filled with petrol or other liquid fuel, with a piece of cloth in its top, that is set on fire and thrown

The rioters were throwing petrol bombs. 暴乱分子在投掷汽油弹。

to throw a petrol bomb at something or someone

He was found guilty of trying to petrol-bomb council buildings. 他被认定犯有试图用汽油弹炸毁议会大楼的罪行。

The girls had threatened to petrol-bomb the home of a security guard. 这些女孩曾威胁要用汽油弹炸毁一名警卫的家。