festered

At the same time, however, Bush sought to address some of the underlying issues — the racist history of the LAPD, chief among them — that festered for decades before exploding into molten rage.

Peace proposals and presidents have come and gone but the problems have festered.

He said this interaction "festered in your mind from that moment onwards and that was enough to trigger an attempt to cause really serious bodily harm - as an act effectively of revenge".

This zinging back-and-forth is also in evidence in the film, in which these sisters metaphorically tear each other apart and then try to heal the wounds that have festered.

McCartney said confusion over the break-up had festered because the band's new manager Allen Klein - with whom he refused to align - said he had needed time to tie up some financial loose ends.