(noun)
to clear a region of something, to remove something from an area, to free something from impurities or undesirable elements;
e.g. They gathered one morning to scour the streets of garbage.
(verb)
to remove something using or as if using water, especially in context of forming a pool or channel by the action of quick-flowing water removing soil or eroding rock;
e.g. The river continued to scour its bed and become deeper.
(verb)
to thoroughly search a region for something or someone, or to travel quickly in a particular direction in pursuit or search of someone/something;
e.g. He began to scour his desk for the missing documents.
(noun)
the action of scrubbing something in order to brighten or clean it;
e.g. She gave the pot a good scour to remove the burnt food.
(noun)
the action of eroding soil/rock, used to describe the behavior of moving water;
e.g. The scour of the ocean's waves eventually formed these cliffs.
(noun)
dysentery or diarrhea affecting livestock , especially pigs and cattle;
e.g. Her animals are affected with scour, so she went to get them medicine.