挑 means “challenge, take on”

いどむ · idomu

Also: contend for, make love to

Kun'yomi (Japanese reading)
いどむ
On'yomi (Chinese reading)
チョウ

JLPT N1 · Taught in secondary school · 9 strokes

The story

A hand (扌) beside 兆, cracks spreading through a heated shell: picture prodding a rival until something gives. 挑む is to take on a challenge, 挑戦 is the challenge itself, and 挑発 is provocation.

Used in 挑戦 (chousen, challenge), 挑む (idomu, to challenge), and 挑発 (chouhatsu, provocation)

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