To Scour

1. (transitive) To clean, polish, or wash something by rubbing and scrubbing it vigorously, frequently with an abrasive or cleaning agent.
2. (transitive) To remove debris and dirt by purging; to sweep along or off (by a current of water).
3. (transitive, veterinary medicine) To clear the digestive tract by administering medication that induces defecation or vomiting; to purge.
4. (transitive, intransitive, veterinary medicine) To (cause livestock to) suffer from diarrhoea or dysentery.
5. (transitive, obsolete) To cleanse (without rubbing).