To clean or polish by hard rubbing. She scoured the pots and pans until they shone.
To search thoroughly and energetically. The police scoured the area for clues.
To remove soil, rock, or other material from (a surface or channel) by the abrasive action of fast-moving water, wind, or ice; to erode. The floodwaters scoured the riverbed down to the bare rock.
To purge the bowels of (a person or animal); to cause diarrhea in. The vet scoured the calf before the competition.