Определение to top it all в Английский Язык Английский Язык словарь
(deyim) (or "to crown it all" or "to cap it all") If you have been describing bad things which happened and then say that to cap it all something else happened, you mean that the final thing was even worse
He spilled red wine on the carpet, insulted my mother, and, to cap it all, he broke my favourite vase.