sediment

Entry Definition
dregs, sediment, residue
(water) its flow slows and suspended matter settles out of it; it filters through (leaving sediment behind)
s/he, it settles to bottom (e.g., sediment; water settling out of water-oil mixture)
s/he roils it, stirs up sediment in it (water); s/he pollutes it (water, well)
s/he roils it, stirs up sediment in it (water); s/he pollutes it (water, well)
(water or other liquid) s/he, it is murky, becomes roiled or cloudy with sediment