Idiom
The detective left no stone unturned to trace the culprit.

used all available means
resorted to illegitimate practices
did very irrelevant things
took no pains

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Idiom
To be above board

To try to be beautiful
To have a good height
None of these
They have no debts
To be honest in any business deal

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Idiom
To play second fiddle

To do back seat driving
To support the role and view of another person
To be happy, cheerful and healthy
None of these
To reduce importance of one's senior

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