be not the done thing

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be not the done thing

Of a given behavior, to be unacceptable, inappropriate, or incorrect in a particular social situation. Primarily heard in UK. You should know better than to wear a skirt like that to a formal dinner; it is simply not the done thing! I'm so glad smoking indoors is not the done thing anymore!
See also: done, not, thing
References in periodicals archive ?
In its response to fears Patel might quit, the Indian finance ministry also emphasised the importance of independence (while grumbling that it isn't the done thing to leak disagreements between fiscal and monetary authorities).
Black isn't the done thing at weddings but navy is an easy alternative.
Wood paints were traditionally gloss, but these days lower-sheen satinwood and eggshell are more fashionable finishes - shiny woodwork isn't the done thing any more.
The tapas-style entre table is sometimes difficult to navigate as the wooden slab-style plates, whilst offering a unique touch, are difficult to appreciate without going back for more, and you feel this isn't the done thing.
Dr Sharon Hopkins, Cardiff and Vale University Health Board's director of public health, said: "There has to be a cultural change with people accepting that smoking isn't the done thing when they are working for a health-based organisation and trying to improve the health of the local population, of which they are a part.
A Taste Test without desserts isn't the done thing, so we took the plunge and ordered clotted cream strawberry ice cream for Rachel, with a chocolate fudge pudding with cream for me.
But apparently this "isn't the done thing in London".
A NICE idea, but haggling just isn't the done thing. These places work on threadbare margins, sometimes just pounds 200 a car, so there's not a lot of wiggle-room.
I was quite pleasantly surprised about the way he proposed to her because he came to ask me for my permission, which I suppose isn't the done thing anymore."
"When we won we threw our hats into the air and we got into trouble for that because that isn't the done thing.
"It isn't the done thing to switch from United to Wednesday, any more than it's acceptable to swap Celtic for Rangers.
The only trouble is that Zubar is yet to realise that there's a time and a place for the F-word and dropping the curse into every other sentence isn't the done thing. Safe to say that he's unlikely to be put up for a TV interview any time soon.
And no sneaking off down the pub to see your mates, because that just isn't the done thing.