To expose hidden criminals and evil deeds; used to describe an honest or astute administration.

to bring secrets to light or expose hidden wrongdoers and their deeds; to reveal hidden evil

(literary) literally to tap the ground with a cane to find the way like a blind person; describes searching for something in the dark or feeling for a way to approach a new field of study.

to tap the ground with a cane to find one's way; to act blindly or without proper guidance

to reveal hidden crimes and bring evil-doers to light

to interrogate or conduct an official inquiry; to question a suspect