濁る【にごる】
to become muddy, to become cloudy, to become turbid, to become impure (of a liquid or gas), to become dull (of a sound, color, etc.), to become indistinct, to become fuzzy, to become hoarse, to become impure (of one's heart, a society, etc.), to be corrupted, to be polluted, to become voiced (of a consonant), to be pronounced as a voiced sound