solecism

An error or improper usage.

[…]to suppose that the general concern of this Country can be directed by thirteen heads, or one head without competent powers, is a solecism, the bad effects of which every Man who has had the practical knowledge to judge from, that I have, is fully convinced of; tho' none perhaps has felt them in so forcible, and distressing a degree.

Why leave the non-enumerated articles, covered by the act of 1864, subject only to this lower rate of duty? Why this distinction? Such a result would, we think, be a solecism, and contrary to the spirit and purpose of the act. It cannot reasonably be supposed that such was the intent of the clause in question.

An error or improper usage.

The "simple" metaphor, such as the instance given, becomes the "continued" metaphor when the analogy or similitude is worked out in a series of phrases and expressions based on the primary metaphor; it is in such "continued metaphors" that the solecism of "mixed" metaphors is likely to occur.

Eliot and Gertrude Stein had a solemn conversation, mostly about split infinitives and other grammatical solecisms and why Gertrude Stein used them.

An error or improper usage.

1778, Fanny Burney, Evelina: Or the History of a Young Lady's Entrance into the World, Letter LXVIII: EVELINA TO THE REV. MR. VILLARS. Clifton, Sept. 28th., "Best young woman!" repeated Mr. Lovel; "'pon honour, Jack, you have made a most unfortunate speech; however, if Lady Louisa can pardon you,-and her Ladyship is all goodness,-I am sure nobody else can; for you have committed an outrageous solecism in good manners."

Under this plea, felons of the worst kind might claim, till this time, to be taken out of the hands of the law judges, and to be tried at the bishops’ tribunals; and at these tribunals, such a monstrous solecism had Catholicism become, the payment of money was ever welcomed as the ready expiation of crime.