entries → 縱
TSUMUGU · C1 (est.) · 字
縱 character · C1 (est.)
縱 ＝ 糸 ＋ 從
ㄗㄨㄥˋ · zòng
verb/adj/conj — to let go, indulge; vertical, lengthwise; even if

字源 FORM — what the parts do

糸義thread, cord
從聲cóng — gives the soundone figure following another (從)
ITcóng → zòng — initial and tone shifted off the donor
A cord (糸) let slack, let run its own way — to loosen, to let go. 從 cóng carries the sound, shifted to zòng, and its "follow" sense leans in: let it follow where it will. From a loosed line: lengthwise (縱向), and "even if" (縱然).

故事 STORY — a scene to remember it by

一條繩子（糸）一鬆手，任它（從）去——放縱了。
A cord (糸) let slack, left to follow its own way (從) — set loose.
字源記憶法
意 · Meanings
(本義)放縱、縱容— to let go, to indulge常用
→縱向、縱貫— vertical, lengthwise常用
→縱然、縱使— even if, even though
(本義) original meaning · → ⇒ each arrow = one more step of extension
關 · Related
從cóngthe bare sound donor — 從 alone is "to follow"; 縱 adds cord 糸 (to loosen)橫héngthe paired opposite — 橫 is crosswise (sideways), 縱 is lengthwise (up-and-down)