TSUMUGU · C1 (est.) · 字
懊
懊 ＝ 忄 ＋ 奧
ㄠˋ · ào
verb — to feel regret, be vexed
字源 FORM — what the parts do
忄義the heart, feeling
Regret works the heart (忄) at its deepest corner — to be vexed. 奧 ào, the inner recess of a room, carries the sound exactly, and the feeling does sit deep and out of reach. So 懊惱 stews, 懊悔 looks back.
故事 STORY — a scene to remember it by
心（忄）的最裡頭那個角（奧），一件悔事卡在那兒，挪不開。
In the deepest inner corner (奧) of the heart (忄), one regret lodges and won't shift.
字源記憶法
意 · Meanings
(本義)懊惱、懊悔— to be vexed, regret常用
→懊喪— dejected — vexation gone flat
(本義) original meaning · → ⇒ each arrow = one more step of extension