To cleanse by hard rubbing; clean by friction; make clean and bright on the surface by rubbing; brighten.To cleanse from grease and dirt by rubbing or scrubbing thoroughly with soap, washing, rinsing, etc.; cleanse by scrubbing and the use of certain chemical appliances: as, to scour blankets, carpets, articles of dress, etc.; to scour woolens.To cleanse or clean out by flushing, or by a violent flood of water.To purge thoroughly or with violence; purge drastically.To cleanse thoroughly in any way; free entirely from impurities, or whatever obstructs or is undesirable; clear; sweep clear; rid.To remove by scouring; cleanse away; obliterate; efface.To run over and scatter; clean out.To rub a surface for the purpose of cleansing it.To cleanse cloth; remove dirt or grease from a texture.To be purged thoroughly or violently; use strong purgatives.n. The clearing action of a strong, swift current through a narrow channel; the removal of more or less of the material at the bottom of a river or tidal channel by the action of a current of water flowing over it with sufficient velocity to produce this effect.n. A kind of diarrhea or dysentery among cattle or other animals; violent purging.n. The material used in scouring or cleansing woolens, etc.To run with celerity; scamper; scurry off or along.To rove or range for the purpose of sweeping or taking something.To run quickly over or along, especially in quest or as if in quest of something.To pass through the soil without the latter adhering, the blade being thus rubbed bright: said of an agricultural implement.n. The violent removal of sand by the wind, especially when it blows through a funnel-shaped pass or canon.