From Longman Dictionary of Contemporary Englishflog something to deathflog something to deathBritish English informalREPEAT to repeat a story or use an idea etc so often that people become bored with it They take a good idea and flog it to death. → flog
Examples from the Corpus
flog something to death• It was a good story a month ago, but the newspapers have really flogged it to death.• The beheading of murderers, the flogging and stoning to death of adulterers, the circumcision of women? 