沈む
しずむ · shizumu · JLPT N3 · verb-godan
to sink
⚓🚢 She's zoomin' down: shizumu = sinking fast, ship or spirits
沈 has the water radical 氵 on the left, so the word is tied to going under water. The same verb covers a sinking ship, a setting sun, and a mood that drops. Sound hook: shizumu ≈ she's zoomin' — straight to the bottom.