TSUMUGU · TOCFL 2 (est.) · 字
深
深 ＝ 氵 ＋ 罙
ㄕㄣ · shēn
adj — deep; profound
字源 FORM — what the parts do
氵義water — measured top to bottom
罙聲shēn — gives the sounda hand reaching down into a cave (穴) to feel how far it goes
Water (氵) you can't touch the bottom of — deep. The right side 罙 draws a hand groping down into a cave (穴) for the bottom; it carries the sound shēn and the very act of probing depth. The same 罙 sits inside 探 (to probe). From deep water: profound (深刻), and the dead of night (深夜).
故事 STORY — a scene to remember it by
站在岸邊往水（氵）裡看，一片暗綠，望不到底。
Standing at the edge, looking down into the water (氵) — dark green, no bottom in sight.
字源記憶法
意 · Meanings
(本義)深、水深— deep常用
→深刻、深入— profound; penetrating常用
⇒深夜、深秋— late at night; deep autumn — far into a span
(本義) original meaning · → ⇒ each arrow = one more step of extension