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to top it all

(US and Australian English to top it all off)

Definition

C2 If you have been describing bad things that happened, and then say that to top it all something else happened, you mean that the final thing was even worse: The washing machine flooded, my car broke down, then to top it all I locked myself out of the house.Worse and worst
(Definition of to top it all from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)