KanjiJLPT N4
Pour

pour, irrigate, shed (tears), flow into, concentrate on, notes, comment, annotate

Mnemonic

A violent storm brews overhead. The lord of the castle raises his goblet and commands the clouds to pour directly into it. Lightning crackles as rain funnels down in a perfect stream. The lord smirks—the storm obeys, pouring endlessly into his cup.
Additional thoughts
Picture the lord standing calmly in the chaos of the storm, arm outstretched, as a focused column of rain pours precisely into his goblet—channeling nature's fury with absolute concentration.
Quick recall
A storm obeys the lord, who commands it to pour rain straight into his goblet.

Details

The keyword for 注 is pour. This kanji conveys the idea of pouring or flowing liquid into something, such as filling a vessel with water. By extension, it also carries the meaning of concentrating or directing one's attention toward something, as if channeling focus the way one would pour a stream of water. It is commonly associated with concepts of injection, annotation, and careful attention.
On'yomi
ちゅう
Kun'yomi
そそ.ぐ、さ.す、つ.ぐ