The kanji 注 primarily conveys the idea of "to pour," "to focus," or "to annotate." It represents the action of directing a liquid, attention, or information towards a specific point or object. It can also imply a commentary or explanation.

・On-yomi (音読み): チュウ (chū) ・Kun-yomi (訓読み): そそ-ぐ (soso-gu) - to pour, to shed; つ-ぐ (tsu-gu) - to fill, to supply.

⚫︎ 注意 (chūi) Translation: Caution; attention; warning. ⚫︎ 注文 (chūmon) Translation: Order (e.g., in a restaurant). ⚫︎ 注目 (chūmoku) Translation: Attention; notice; observation.

The kanji 注 is a phono-semantic compound (形声文字). It combines the radical 氵 (water) on the left side, which indicates a connection to liquid, with the phonetic component 主 (shu). 主 provides the sound and contributes to the meaning, which can relate to "main" or "master." Therefore, the character originally meant "to pour water" or "to irrigate" and later expanded to include the broader concepts of focusing attention or adding annotations.