Common Mistakes In Writing

noun a breach of good manners or etiquette; a socially awkward or tactless act

• Using 'they' as a singular pronoun is considered a solecism in formal writing.
• Making grammatical errors like that is a big solecism.
• Don't be a solecism, dude.
• His lack of manners was a solecism in an otherwise elegant dinner party.

noun a mistake in printed or typed material resulting from an error in typing or printing

• The report contained a typographical error in the third paragraph.
• Oops, there's a typo in this document.
• I spotted a typo in the text.
• His speech was flawless except for one small typographical error.