beat a dead horse
Also, flog a dead horse. Try to revive interest in a hopeless issue. For example, Politicians who favor the old single-tax idea are beating a dead horse. From the 1600s on the term dead horse was used figuratively to mean “something of no current value,” specifically an advance in pay or other debt that had to be worked (“flogged”) off. [Second half of 1800s]
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How to use beat a dead horse in a sentence
The cartoonist, better known as Charb, was shot dead Wednesday.
ROME — What does it take for a Hollywood A-lister to get a private audience with Pope Francis?Pope Francis Has the Pleasure of Meeting Angelina Jolie for a Few Seconds|Barbie Latza Nadeau|January 8, 2015|DAILY BEAST
A policewoman was shot dead this morning while law enforcement searched for the Charlie Lebdo killers.
Absent a body, no one can say with absolute certainty whether Castro is dead, even if all signs point in that direction.
He beat his illness twice, wrote about his battles with the disease, and continued broadcasting even as his health was failing.Remembering ESPN’s Sly, Cocky, and Cool Anchor Stuart Scott|Stereo Williams|January 4, 2015|DAILY BEAST
A little boy of four was moved to passionate grief at the sight of a dead dog taken from a pond.Children's Ways|James Sully
Now-a-days it is the bankrupt who flouts, and his too confiding creditors who are jeered and laughed at.Glances at Europe|Horace Greeley
At the mention of the Merrill Horse, Poindexter's countenance took on a demoniac expression.
But you are mistaken in thinking the force west consists of the entire Merrill Horse.
It was at this parliament that the famous acts against horse racing and deceitful gaming were passed.The Every Day Book of History and Chronology|Joel Munsell