A blunder refers to a "stupid, careless mistake". Specific instances include: Blunder (chess), a very poor move in chess Hopetoun Blunder, an event in Australian history Brand blunder, in marketing Himalayan Blunder, in Indian history
Television Blunder (TV series), a British comedy programme first shown on E4 in 2006
See also There are various colloquial terms, as a rule with slightly different connotations, for various forms and contexts of blunder. For example: Boner, which has been used both as a synonym for "howler" and for more material blunders