it/that won't do

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it/that won't do

It/that is totally unacceptable or unsatisfactory. Primarily heard in UK. A: "It will probably be the end of next week before I'm finished with this project." B: "That simply will not do, Jenkins. I don't care how, but I want it finished by Monday morning!" I was going to tell them I couldn't come to dinner because of a prior engagement, but I knew that wouldn't do.
See also: that

it/that (just) won’t ˈdo

,

it/that will never ˈdo

(especially British English) used to say that a situation is not satisfactory and should be changed or improved: He’s spending every afternoon in the park with his friends instead of going to school, and that just won’t do!I feel very upset but it would never do to show it.
See also: that
References in classic literature ?
I don't wish to say a single word that might be afrerwards remembered as unpleasant; but it won't do.
So, I have openly given you to understand that--' Mr Boffin sought for a new turn of speech, but could find none so expressive as his former one, repeated in a confidential tone, '--that it won't do.
So you've got to know what it is it won't do before you do your gapping.
It won't do to denounce the voyeurism that drives Nicholas Barker's ``Unmade Beds'' because the truth is that it hooks us from the start.