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scour (v.1)

"cleanse by hard rubbing," c. 1200, from Middle Dutch scuren, schuren "to polish, to clean," and from Old French escurer, both from Late Latin excurare "clean off," literally "take good care of," from Latin ex "out" (see ex-) + curare "care for, take care of" (see cure (v.)). Possibly originally a technical term among Flemish workmen in England. Related: Scoured; scouring. As a noun, 1610s, from the verb.

scour (v.2)

"move quickly in search of something," c. 1300, probably from Old Norse skyra "rush in," related to skur "storm, shower, shower of missiles" (see shower (n.)). Perhaps influenced by or blended with Old French escorre "to run out," from Latin excurrere (see excursion). Sense probably influenced by scour (v.1).

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Definitions of scour from WordNet
1
scour (v.)
examine minutely;
The police scoured the country for the fugitive
scour (v.)
clean with hard rubbing;
Synonyms: scrub
scour (v.)
rub hard or scrub;
scour the counter tops
Synonyms: abrade
scour (v.)
rinse, clean, or empty with a liquid;
Synonyms: flush / purge
2
scour (n.)
a place that is scoured (especially by running water);
From wordnet.princeton.edu