堕落
duòluò · HSK 7
to degrade; to degenerate
⬇️ duo-luo sounds like do low — to sink low is to degenerate
The characters break down: 堕 means to fall or sink, 落 means to drop or decline. Together they reinforce the downward slide. The sound duo-luo echoes do low — doing low, sinking into degeneracy.
落 — grass radical 艹 + 洛 (water 氵 + 各)
Originally written with the grass radical 艹 over 洛, depicting leaves falling from plants. 洛 serves as the phonetic component (giving the luò sound) while 艹 supplies the meaning of vegetation. The sense extended from 'leaves falling' to the general meaning of falling, dropping, or settling down.