silt up if something silts up or is silted up, it becomes filled with silt（使）淤塞:•The old harbour silted up years ago.这个老港湾在许多年前就淤塞了。ˌsilt sth↔ˈup|ˌsilt ˈupto block sth withsilt;to become blocked withsilt（使）淤塞Sand has silted up the river delta.泥沙把这条河的三角洲淤塞了。The harbour has now silted up.港口现已淤塞。 |