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

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

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Idiom
To take the bull by the horns

To grapple courageously with a difficulty that lies in our way
To handle it by fierce attack
To punish a person severely for his arrogance
To bypass the legal process and take action according to one's own whims

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