1
: loose sedimentary material with rock particles usually ¹/₂₀ millimeter or less in diameter
also
: soil containing 80 percent or more of such silt and less than 12 percent of clay
2
: a deposit of sediment (as by a river)
silted; silting; silts
: to become choked or obstructed with silt
—often used with up
the channel silted up
: to choke, fill, cover, or obstruct with silt or mud
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Merriam-Webster unabridged
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