once and for all

Idioms and Phrases

As a settled matter, finally, permanently, as in Once and for all, we're not hiring that organist again , or We've settled that question once and for all . This expression is in effect an abbreviation for “one time and for all time.” [Late 1400s]

Example Sentences

The less urbanized Persian empire recovered first and seized the chance to launch a once-and-for-all war against depleted Rome.

From The Daily Beast