TSUMUGU · TOCFL 2 (est.) · 字
暖
暖 ＝ 日 ＋ 爰
ㄋㄨㄢˇ · nuǎn
adj — warm
字源 FORM — what the parts do
爰聲yuán — gives the sounda hand passing a cord down to another hand
I≠yuán → nuǎn — the reading drifted far from the donor
The sun (日) warming everything it touches — warm, 溫暖、暖和. 爰 yuán gives the sound, drifted hard to nuǎn; the cleaner donor still sounds in 援 (to pull, yuán) and 緩 (slow, huǎn).
意 · Meanings
(本義)溫暖— warm常用
→暖和— warm, mild常用
→暖氣— heating
(本義) original meaning · → ⇒ each arrow = one more step of extension