反 means “against, anti-”

はん · han

Kun'yomi (Japanese reading)
そる, そらす, かえす, かえる
On'yomi (Chinese reading)
ハン, ホン, タン, ホ

JLPT N3 · Taught in grade 3 · 4 strokes

The story

A hand (又) pushing back against a cliff (厂): resistance, turning things around. 反対 is opposition, but 反 also turns inward: 反省, reflecting on your own mistakes, is so valued in Japan that teams hold a 反省会 after events.

Used in 反対 (hantai, opposition/opposite), 反省 (hansei, reflection on one's mistakes), and 違反 (ihan, violation)

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