noun
probing; sounding out; exploratory investigation
Refers to the act of discreetly investigating or feeling out a situation, person's intentions, or physical space. Can be used literally (e.g., probing with a tool) or figuratively (e.g., sounding out someone's opinion). The gloss 'spy' is a loose extension for covert information gathering.
彼の本心を探りを入れてみた。
I tried to sound out his true feelings.
警察は事件の探りを続けている。
The police are continuing their investigation into the case.
Verb form meaning 'to probe' or 'to search for'. 探り is the noun derived from it.
A more formal and systematic 'investigation' or 'survey', often official or academic. 探り implies a more tentative, hands-on, or discreet approach.
Noun form of the verb 探る (さぐる, 'to probe, search for'). The verb itself is of native Japanese origin.