TSUMUGU · TOCFL C1 (est.) · 字
隧
隧 ＝ 阝 ＋ 遂
ㄙㄨㄟˋ · suì
noun — a tunnel, an underground passage
字源 FORM — what the parts do
阝義a mound, earth banked up
遂聲suì — gives the sound (a road-and-go graph 辵 with 㒸)
Earth banked high (阝) bored through, with 遂 suì giving the sound. The passage runs clean under the bank from one side to the other — a tunnel (隧道).
故事 STORY — a scene to remember it by
整座土坡（阝）被鑿穿，一條暗道從這頭直通那頭。
The whole bank of earth (阝) is bored straight through — a dark passage running clean from one side to the other.
字源記憶法
意 · Meanings
(本義)隧道— a tunnel常用
→隧洞— a tunnel-hole, a bore
(本義) original meaning · → ⇒ each arrow = one more step of extension
關 · Related
遂suìthe sound donor — 遂 keeps its road-and-go graph, 隧 banks the mound beside it