諭 means “admonish, reason with”

さとす · satosu

Also: rebuke, charge, warn

Kun'yomi (Japanese reading)
さとす
On'yomi (Chinese reading)
ユ

JLPT N1 · Taught in secondary school · 16 strokes

The story

Words (言) beside 兪: picture a teacher leaning in to talk a student around, quietly, without shouting. 諭す is to reason with someone gently, and 教諭 is a schoolteacher's official title, as in news reports of a 中学校教諭.

Used in 諭す (satosu, to admonish/reason with), 教諭 (kyouyu, teacher), and 説諭 (setsuyu, admonition)

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