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| Date: | 1600-1700 |
| Origin: | Perhaps from Latin flagellare 'to whip' |
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flog
past tense and past participle flogged, present participle flogging [transitive]
past tense and past participle flogged, present participle flogging [transitive]1 to beat a person or animal with a whip or stick : 
He was publicly flogged and humiliated.
He was publicly flogged and humiliated.2 informal to sell something : I'm going to flog all my old video tapes.
I'm going to flog all my old video tapes.3 to be wasting time or effort by trying to do something that is impossible
be flogging a dead horse
spoken4 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 something to death
British English informalThey take a good idea and flog it to death.
