Flogging a dead horse
Flogging a dead horse (also beating a dead horse) is an Anglophone idiom that means that a particular effort is futile, a waste of time without a positive outcome, e.g. such as flogging a dead horse, which will not compel him to useful work. Early usage. The expression is said to have been popularized by the English politician and orator John Bright. Speaking in the House of Commons in March 1859 on Bright's efforts to promote parliamentary reform, Lord Elcho remarked that Bright had not been "satisfied with the results of his winter campaign" and  that "a saying was attributed to him [Bright] that he [had] found he was 'flogging a dead horse'." The earliest instance cited in the "Oxford English Dictionary" dates from 1872, when "The Globe" newspaper, reporting the Prime Minister, William Gladstone's, futile efforts to defend the Ecclesiastical Courts and Registries Bill in the Commons, observed that he "might be said to have rehearsed that particularly lively operation known as flogging a dead horse". Earlier related terms. Some scholars claim that the phrase originated in 17th-century slang, when a horse was a symbol of hard work. A "dead horse" came  to mean something that had become useless. In gambling, "playing a dead horse" meant wagering on something, for instance a hand of cards, that was almost sure to lose. In a 17th-century quote from a collection of documents owned by the late Earl of Oxford, Edward Harley, In journeyman printer's slang from the 18th and 19th centuries, work that was charged for on a bill, but not yet carried out, was called "horse". Carrying out that work was said to be "working for a dead horse", since no additional benefit would be gained by the labourer when the  work was complete. Many sailors were paid in advance for their first month's work. In his book "Old England and New Zealand", author Alfred Simmons gives detailed explanation and background of the "Flogging the Dead Horse" ceremony, performed by a ship's crew at the end of the first month of their voyage at which time wages resumed. The sailors would get paid in advance of leaving the harbour, spend their money, and embark the ship with nothing. This situation allowed them to exclaim the horse symbolising their usual hard work, without money for motivation, was dead. However, once  a month had passed, the sailors would have reached the Horse latitudes where wages due and paid would prompt the horse to live again. One of the earliest synonyms may be found in an ancient Greek play by Sophocles, "Antigone",