If rain or floods wash away something, they destroy it and carry it away. Flood waters washed away one of the main bridges in Pusan
remove by the application of water or other liquid and soap or some other cleaning agent; "he washed the dirt from his coat"; "The nurse washed away the blood"; "Can you wash away the spots on the windows?"; "he managed to wash out the stains"
[ 'wosh, 'wäsh, chiefly ] (verb.) before 12th century. Middle English, from Old English wascan; akin to Old High German waskan to wash and perhaps to Old English wæter water.