Longman Dictionary of Contemporary English homepage

Date: 1600-1700
Origin: Perhaps from Latin flagellare 'to whip'

flog

verb
     
flog 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.
2 informal to sell something:
I'm going to flog all my old video tapes.
3

be flogging a dead horse

spoken to be wasting time or effort by trying to do something that is impossible
4

flog something to death

British English informal 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.

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