晕
yùn · HSK 6
dizzy
☀️ sun 日 beats down on army 军 — troops swoon and faint
The character stacks sun (日) over army (军). Swoon rhymes with yùn and means the same thing: to feel dizzy and pass out from the heat.
晕 — sun 日 on top + army/chariot 軍 (jūn) below
Originally a phono-semantic compound: 日 (sun) gives the meaning of a hazy halo or ring of light around the sun or moon, while 軍 hints at the sound. From 'solar/lunar halo' it extended to 'dizzy, faint, giddy,' as if one's vision were ringed and blurred.