训诫 Origin — Chinese Character Wiki

xun, xùn teach, train Simplified

Phonosemantic compound. 讠 represents the meaning and 川 represents the sound. Simplified form of 訓.

Components

讠 Meaning component

yán speech

讠 is a component form of 言.

川 Sound component

chuān stream

Change in sound

训 and 川 don't sound similar in modern Mandarin due to historical phonetic changes. They were more similar in Old Chinese.
训 *l̥u[n]-s (W dialect: *l̥- > x- )
川 *t.l̥u[n] (MC -jwen is irregular)

Historical Pronunciations

Sources

Character origin: 漢語多功能字庫
Readings & variants: Unicode

jiè warn Simplified

Words 讠 of warning 戒; 戒 also provides the pronunciation

Components

讠 Meaning component

yán speech

戒 Sound Meaning component

jiè warn

Sources

Readings & variants: Unicode

xun, xùn teach, train Traditional

Phonosemantic compound. 言 represents the meaning and 川 represents the sound.

Components

言 Meaning component

yán speech

川 Sound component

chuān stream

Change in sound

訓 and 川 don't sound similar in modern Mandarin due to historical phonetic changes. They were more similar in Old Chinese.
訓 *l̥u[n]-s (W dialect: *l̥- > x- )
川 *t.l̥u[n] (MC -jwen is irregular)