Origin
Solecism was originally a toponym for people from a Greek city where a corrupt form of Greek was spoken. Only in Middle French did it come to mean “a mistake in speaking or writing”.
Quotes
The idea of having committed the slightest solecism in politeness, whether real or imaginary, was agony to him; for perhaps even guilt itself does not impose upon some minds so keen a sense of shame and remorse, as a modest, sensitive, and inexperienced youth feels from the consciousness of having neglected etiquette, or excited ridicule.
— Sir Walter Scott, Waverly