Scour meaning : The removal of sediment caused by swiftly moving water. A place scoured out by running water, as in the bed of a stream below a waterfall. A place where wool is washed to remove grease and impurities prior to processing. To clean, polish, or wash something by rubbing and scrubbing it vigorously, frequently with an abrasive or cleaning agent. To remove debris and dirt by purging; to sweep along or off (by a current of water). To clear the digestive tract by administering medication that induces defecation or vomiting; to purge. To (cause livestock to) suffer from diarrhoea or dysentery. To cleanse (without rubbing).