偵 means “spy, investigate”

てい · tei

On'yomi (Chinese reading)
テイ

JLPT N1 · Taught in secondary school · 11 strokes

The story

A person (亻) beside 貞, which once meant to divine: picture someone reading clues the way a fortune teller reads signs. 探偵 is a private detective, as in 名探偵コナン, Detective Conan, and 偵察 is scouting out the enemy.

Used in 探偵 (tantei, detective), 偵察 (teisatsu, reconnaissance), and 内偵 (naitei, secret investigation)

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Readings from KANJIDIC2, © EDRDG, CC BY-SA.