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 won't 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 periodicals archive ?
And we went through about probably a year's mapping of just finding out what it is that the system would do and what it wouldn't do. No ERP solution really worked for us as it was, because we're in a multidimensional business, which means style, color, size.
"But what it wouldn't do is put a contractor in the position of putting its entire corporation at risk.
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