A faux pas or breach of etiquette; a transgression against the norms of expected behavior.
An erroneous or improper usage.
Error in the use of language.
A wrongful act, whether intentional or negligent, regarded as non-criminal and unrelated to a contract, which causes an injury and can be remedied in civil court, usually through the awarding of damages.
Synonym of tart (“sharp- or sour-tasting; (figuratively) keen, severe, sharp”)