喝 means “shout, roar”

かつ · katsu

Also: hoarse, scold

On'yomi (Chinese reading)
カツ

JLPT N1 · Taught in secondary school · 11 strokes

The story

A mouth (口) letting out a single roar: picture a Zen master's 喝, shouted to jolt a monk awake. 一喝 is a thunderous rebuke, 恐喝 extortion by threats, and 拍手喝采, clapping and cheering, is thunderous applause.

Used in 喝采 (kassai, applause/cheers), 恐喝 (kyoukatsu, extortion), and 一喝 (ikkatsu, thunderous rebuke)

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