noun
fine sand, clay, or other material carried by running water and deposited as a sediment, especially in a channel or harbor
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The silt in the riverbed is being carefully studied by geologists.
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I got my shoes all dirty from walking through that silt near the river.
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I can't believe I got stuck in that silt while trying to cross the stream.
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The silt of doubt clouded his mind, making it hard for him to think clearly.