The be-all and end-all - Idioms by The Free Dictionary
the be-all and end-all
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(not) the be-all and end-all
The most important event or thing. Often used in the negative. My little sister thinks that a date with the captain of the football team is just the be-all and end-all of her life right now. Oh honey, I know you're disappointed, but failing the driver's license test is not the be-all and end-all. You'll just practice some more and then take it again.
the be-all and end-all a feature of an activity or a way of life that is of greater importance than any other. informal
the ˌbe-all and ˈend-all (of something) (informal) the most important thing/person; the only thing/person that matters: His girlfriend is the be-all and end-all of his existence. ♢ I’ll never be rich, but money isn’t the be-all and end-all, you know.