Idiom
He has built a big business empire by his sharp practices.

sharp intelligence
keen business skills
dishonest dealings
extreme hard work

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Idiom
At one's beck and call

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

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Idiom
Will o' the wisp

To act in a childish way
Anything which eludes or deceives
To act in a foolish way
To have desires unbacked by efforts

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