TSUMUGU · TOCFL 1 · 字
紹
紹 ＝ 糸 ＋ 召
ㄕㄠˋ · shào
verb — to join on, carry forward; 介紹's 紹
字源 FORM — what the parts do
糸義silk threads
{zh,ch,sh}Izhào → shào — zh stepped to sh inside {zh,ch,sh}
A broken thread (糸) tied on to the next — to join, to carry the line forward. 召 zhào gives the sound, zh stepped to sh. Introducing does the same work: two strangers, one knot — 介紹.
故事 STORY — a scene to remember it by
兩段斷線（糸），指尖捻一捻，又成一條。
Two broken ends of silk (糸); a twist of the fingers, one thread again.
字源記憶法
意 · Meanings
(本義)繼紹— to join on — the line carried forward
→介紹— to introduce — knotting two strangers' threads常用
(本義) original meaning · → ⇒ each arrow = one more step of extension