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be–all and end–all

be–all and end–all /ˈbiːˌɑːləndˈɛndˌɑːl/ noun
be–all and end–all
/ˈbiːˌɑːləndˈɛndˌɑːl/
noun
Britannica Dictionary definition of BE–ALL AND END–ALL

the be-all and end-all

: the most important part of something or the reason for something