entries → 嘯
TSUMUGU · B2 (est.) · 字
嘯 character · B2 (est.)
嘯 ＝ 口 ＋ 肅
ㄒㄧㄠˋ · xiào
verb — to whistle; to howl (wind, beast)

字源 FORM — what the parts do

口義a mouth, blowing
肅聲sù — gives the sound
IFsù → xiào — initial and rime both moved
Breath drawn to a thin, long sound at the mouth (口) — to whistle. 肅 sù carries the sound, the same donor under 簫 and 蕭, worn far to xiào. The word stretches to the wind and the beast: 呼嘯、長嘯.

故事 STORY — a scene to remember it by

撮起嘴（口），一聲長嘯拉得又細又遠。
The mouth (口) draws to a point, and one long whistle pulls thin and far.
字源記憶法
意 · Meanings
(本義)呼嘯、長嘯— to whistle, to give a long cry常用
→嘯叫— to howl, to scream (wind, beast)
(本義) original meaning · → ⇒ each arrow = one more step of extension
關 · Related
肅sùthe sound half alone — solemn, austere; 嘯 adds the mouth 口簫xiāoshares the 肅 donor — a bamboo flute (竹), not the mouth