once and for all

US /wʌns ænd fɔr ɔl/
UK /wʌns ænd fɔr ɔl/
"once and for all" picture
1.

finally and definitively; for the last time

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Let's settle this argument once and for all.
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I want to finish this project once and for all.
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onceall in allallat allonce in a lifetimebe all things to all peopleall singing, all dancing