Idiom
A fool's errand

A blunder
An impossible task
None of these
A useless undertaking

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Idiom
To put one's hand to plough

Take interest in technical work
To take a difficult task
To take up agricultural farming
To get entangled into unnecessary things
None of these

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Idiom
At one's beck and call

To be in an advantageous position
Enjoying oneself without caring for others
To be always at one's service
To be under one's subjugation

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