TSUMUGU · TOCFL 1 (est.) · 字
郵
郵 ＝ 邑 ＋ 垂
ㄧㄡˊ · yóu
noun/verb — post, mail; to mail, to post
字源 FORM — what the parts do
邑義a settlement, a district (right 阝)the walled place where people live — here a relay station
垂聲chuí — gives the sound, worn from chuí to yóubranches hanging down (drooping) — also a border, an edge
IFTchuí → yóu — initial, final and tone all shifted
A border settlement (邑) at the edge — 垂, the hanging-down piece, doubles as the frontier and carries the sound, worn to yóu. The frontier post relayed dispatches; from it, the mail, the post: 郵件、郵政、郵局. To send by post: 郵寄.
故事 STORY — a scene to remember it by
邊境的驛站（邑）立在最遠的垂邊（垂），文書一站一站傳——郵。
The relay station (邑) stands at the far drooping edge (垂), dispatches passed post to post — that is 郵.
字源記憶法
意 · Meanings
(本義)邊郵— a frontier relay post
→郵件、郵政— mail, post常用
⇒郵寄、郵票— to mail; a stamp常用
(本義) original meaning · → ⇒ each arrow = one more step of extension