Choose the alternative which best expresses the meaning of the idiom/phrase:Plough the sands
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Idioms often have meanings that are different from the literal interpretation of the words. "Plough the sands" means wasting effort on something impossible or unproductive.
"Plough the sands" is an idiomatic expression meaning a futile or useless effort, like trying to plough something that is not suitable for ploughing. The correct meaning corresponds to "Futile labour."