濁 means “muddy, cloudy, voiced”

にごる · nigoru

Also: uncleanness, wrong, nigori

Kun'yomi (Japanese reading)
にごる, にごす
On'yomi (Chinese reading)
ダク, ジョク

JLPT N1 · Taught in secondary school · 16 strokes

The story

Water (氵) beside 蜀, a big-eyed (罒) bug (虫) curled up (勹): picture grubs stirring a pond to mud. 濁る is to go cloudy, and the 濁点, the two dots that turn か into が, marks the 濁音, the muddied, voiced sounds.

Used in 濁る (nigoru, to become cloudy), 濁点 (dakuten, voicing mark), and 濁音 (dakuon, voiced sound)

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Readings from KANJIDIC2, © EDRDG, CC BY-SA.