DREDGE

(REMOVE) [verb] [T] - to remove unwanted things from the bottom of (a river, lake, etc.) using a sucking or other device, or to search (an area of water) for something using this methodWhen too much silt accumulates at the canal bottom, they have to dredge the canal.The police are dredging the lake for his body.They dredged up (= brought to the surface) the man's clothes but not his body. [M]If you dredge up something such as a memory or event, you remember it.Seeing her son after all these years dredged up some painful memories for her. [M]