忘れる
わすれる · wasureru · JLPT N5 · verb-ichidan
to forget
忘 = 亡 (lost) + 心 (heart/mind): what the mind has lost
The kanji 忘 stacks 亡 (to perish, be lost) on top of 心 (heart, mind), so forgetting is literally a thing lost from the mind. Sound hook: wasureru starts like was — it WAS in my head, now it is gone.
忘 — 亡 (lose/perish) on top + 心 (heart) on bottom
忘 is a semantic-phonetic compound. The bottom 心 (heart/mind) gives the meaning, since forgetting happens in the mind, while the top 亡 (to lose, perish) supplies both the sound and the sense of something gone. Together they depict a thought lost from the heart — to forget.