更 means “renew, alter, further”

こう · kou

Also: grow late, night watch, sit up late, of course

Kun'yomi (Japanese reading)
さら, さらに, ふける, ふかす
On'yomi (Chinese reading)
コウ

JLPT N3 · Taught in secondary school · 7 strokes

The story

Picture a day (日) struck off with a fresh line (一): out with the old. 更新 is renewing a visa or refreshing a web page, 変更 is a change of plans, and 夜更かし is staying up as the night grows late.

Used in 変更 (henkou, change), 更新 (koushin, renewal/update), and 夜更かし (yofukashi, staying up late)

More from Time & Change

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