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once and for all

 
See:
once
part of speech: phrase
definition 1: firmly and decisively, with absolute finality.
She decided, once and for all, that she would never go back to that place.I'm telling you this once and for all: I'm not lending you any more money.
definition 2: without a doubt, either now or ever; absolutely.
With this act of bravery, he showed once and for all that he was not a coward.