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silt (n.)

mid-15c., originally "sediment deposited by seawater," probably from a Scandinavian source (compare Norwegian and Danish sylt "salt marsh"), or from Middle Low German or Middle Dutch silte, sulte "salt marsh, brine," from Proto-Germanic *sultjo- (source also of Old English sealt, Old High German sulza "saltwater," German Sulze "brine"), from PIE root *sal- "salt."

silt (v.)

"to become choked with silt" (of river channels, harbors, etc.), 1799, from silt (n.). Related: Silted; silting.

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Definitions of silt from WordNet
1
silt (v.)
become chocked with silt;
The river silted up
Synonyms: silt up
2
silt (n.)
mud or clay or small rocks deposited by a river or lake;
From wordnet.princeton.edu