What does 'No ifs or buts' mean?

Ifs and Buts is a term used to describe the reasons people give for not wanting to do something. To show that you don't wish to accept any excuses, you can tell somebody that you wish to hear no ifs or buts Here IF & BUT have become nouns

All idioms have been editorially reviewed, and submitted idioms may have been edited for correctness and completeness.

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