放置
ほうち · houchi · JLPT N1 · noun
iodine
放 — 方 (square/phonetic) + 攵 (rap/strike radical)
放 is a semantic-phonetic compound: 方 supplies the sound and 攵 (a hand holding a stick) supplies the meaning of striking or driving away. The original sense was to banish or drive out, which broadened over time to 'release', 'let go', and 'put down'.
置 — net 罒 (top) + straight 直 (bottom)
Originally a phono-semantic compound: the net 网/罒 on top suggested the idea of catching or pardoning a criminal, while 直 ('straight, upright') gave the sound and hinted at setting things upright. The meaning shifted from 'pardon, set free' to the modern senses 'place, put, set up, establish'.