strong criticism or opposition

She took/caught some flak from her parents about her new dress. 她的新衣服遭到了父母的一通批评。

the firing of guns from the ground at enemy aircraft, or the bullets, etc. that the guns fire

They flew into heavy flak over the target area. 他们飞进目标地区，遭到了高射炮火的猛烈射击。