silt up (obj) silt (obj) up sIlt v adv To silt up is to (cause to) become blocked with silt. 被淤泥充塞 Mud has silted up the part of the river where we used to keep our boat. [M] 河里原先我们停船的地方现在被淤泥积塞了。 The harbour silted up many years ago. [I] 这个港口多年前被淤泥堵塞了。