抗 means “oppose, resist, anti-”

こう · kou

Also: confront, defy

Kun'yomi (Japanese reading)
あらがう
On'yomi (Chinese reading)
コウ

JLPT N1 · Taught in secondary school · 7 strokes

The story

A hand (扌) raised and the head held high (亢): standing up to someone. 抗議 is a protest, 対抗 is rivalry, 抗生物質 are antibiotics, and every Japanese parent knows the 反抗期, a child's rebellious phase.

Used in 抗議 (kougi, protest), 対抗 (taikou, rivalry/opposition), and 反抗 (hankou, defiance/rebellion)

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