冗 means “superfluous, idle”

じょう · jou

Also: uselessness

On'yomi (Chinese reading)
ジョウ

JLPT N1 · Taught in secondary school · 4 strokes

The story

A cover (冖) thrown over a stool (几) nobody uses: something extra, sitting idle. 冗 is the superfluous: 冗長 is long-winded, and 冗談, idle talk, is a joke, as in 冗談でしょう, you must be kidding.

Used in 冗談 (joudan, joke) and 冗長 (jouchou, verbose/redundant)

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