注 means “pour, focus”

ちゅう · chuu

Also: irrigate, shed (tears), flow into

Kun'yomi (Japanese reading)
そそぐ, さす, つぐ
On'yomi (Chinese reading)
チュウ

JLPT N4 · Taught in grade 3 · 8 strokes

The story

Water (氵) directed toward the master's lamp (主): pouring with care at a single point. To pour attention is 注意; to pour your order across the counter is 注文.

Used in 注意 (chuui, caution), 注文 (chuumon, order), and 注ぐ (sosogu, to pour)

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