浑 has two main uses: (1) 'muddy/muddled' as in 浑水 (muddy water), 浑浊 (turbid); (2) 'whole/entire' as in 浑身 (whole body), 浑然一体 (a seamless whole). Context determines the meaning.
culture
The idiom 浑水摸鱼 (húnshuǐ mōyú, 'fish in muddy waters') means to take advantage of a chaotic situation for personal gain.