狂 means “go mad, crazy”

くるう · kuruu

Also: lunatic, insane, confuse

Kun'yomi (Japanese reading)
くるう, くるおしい
On'yomi (Chinese reading)
キョウ

JLPT N1 · Taught in secondary school · 7 strokes

The story

A beast (犭) beside a king (王): picture a dog that thinks it rules the world. 狂う is to go mad, or to go wrong as a clock or a plan does, 熱狂 is frenzy, and 狂言 is the comic theater performed between Noh plays.

Used in 狂う (kuruu, to go mad/go wrong), 熱狂 (nekkyou, frenzy), and 狂言 (kyougen, kyogen comic theater)

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