pound away at something/someone
phrasal verb with pound verb [ I or T ] uk/paʊnd/ us/paʊnd/
指责，批评;劝说;对…施加压力
to criticize something or try to get someone to do something
The campaigners have promised to keep pounding away at the council until the decision to build the road is reversed. 运动发起人保证将不断向市政委员会施加压力，直到他们取消筑路的决定。