Synonyms of once and for all in English:

once and for all


See definition of once and for all (or once for all)

phrase

1‘you must decide once and for all’

SYNONYMS
conclusively, decisively, finally, positively, absolutely, determinedly, definitely, definitively, irrevocably

2‘he has gone once and for all’

SYNONYMS
for good, for always, forever, permanently, finally, in perpetuity
informal for keeps