ひそかに探り出すの英語

to investigate secretly

to investigate and find out something

to watch secretly

to look at something carefully, in order to find out the facts about it

a locate the source

to inquire into the truth

to sound one's views―feel one's pulse

to grope for anything in the dark

to sound one's views―feel one's pulse

to seek places of scenic beauty

to grope for―feel for―fumble for―anything

to feel the enemy―feel for the enemy―scout

I have smelt out a plot―scented out a plot.

to trace out a crime

to inquire into the actual state of matters―get behind the scenes

to explore a savage country

to search for something unknown

to trace the origin

to see the sights of a country

to inquire into the state of affairs―see how the land lies―find out how the wind lies

to feel for anything in one's pocket―fumble for anything in one's pocket

to search deep

seek indirectly

to feel the ground

to cast about for the scent

to find something after having searched for it

to trace a crime

（探針を用いてなら） to probe a wound―sound a wound―（探針を用いずになら）―explore a wound

to inquire into the state of affairs

to probe a wound