To clean, polish, or wash something by rubbing and scrubbing it vigorously, frequently with an abrasive or cleaning agent.

“He scoured the burnt food from the pan.”

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 scour a horse”

To search an area thoroughly.

“They scoured the scene of the crime for clues.”

To run with speed; to scurry.

To move swiftly over; to brush along.

The act of cleaning a surface by rubbing it with a brush, soap and water.

Diarrhea. (Now used only of livestock, though also sometimes used of humans into the 1600s.)