"scours" in the noun sense

1. scour

a place that is scoured (especially by running water)

"scours" in the verb sense

1. scour

examine minutely

"The police scoured the country for the fugitive"

2. scrub, scour

clean with hard rubbing

"She scrubbed his back"

3. scour, abrade

rub hard or scrub

"scour the counter tops"

4. flush, scour, purge

rinse, clean, or empty with a liquid

"flush the wound with antibiotics"

"purge the old gas tank"

Source: WordNet® (An amazing lexical database of English)

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