渦 means “whirlpool, swirl”

うず · uzu

Also: eddy, vortex

Kun'yomi (Japanese reading)
うず
On'yomi (Chinese reading)
カ

JLPT N1 · Taught in secondary school · 12 strokes

The story

Water (氵) beside 咼, the part 過, to pass, is built on: water that passes round and round. 渦 is a whirlpool, like the 渦潮 of the Naruto Strait or the pink swirl in a slice of naruto in ramen, and 渦中 is the thick of a scandal.

Used in 渦 (uzu, whirlpool), 渦巻き (uzumaki, spiral/swirl), and 渦中 (kachuu, in the thick of)

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