verb
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to go over or look through for the purpose of finding something; to explore; to search.
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to search for and pick out.
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to look at or into critically or methodically in order to find out the facts, condition, etc. of; to investigate; to examine.
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to observe carefully.
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to clean; to cleanse; to remove adulterants.
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to pass through a screen, sieve, filter, etc. to remove adulterants from; to filter; to strain.
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to rid of impurities or pollution; to purify.
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to purify and make more glittering (by or as by melting in fire).
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to remove errors from (a written passage); to correct.
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to bring something (as a dilapidated building) to its original or near original state, by repairing or reconstructing.
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to untangle a complicated, problamitic issue.