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From The Collaborative International Dictionary of English v.0.48:
Purge \Purge\, v. t. [imp. & p. p. Purged; p. pr. & vb. n. Purging.] [F. purger, L. purgare; purus pure + agere to make, to do. See Pure, and Agent.] 1. To cleanse, clear, or purify by separating and carrying off whatever is impure, heterogeneous, foreign, or superfluous. "Till fire purge all things new." --Milton. [1913 Webster] 2. (Med.) To operate on as, or by means of, a cathartic medicine, or in a similar manner. [1913 Webster] 3. To clarify; to defecate, as liquors. [1913 Webster] 4. To clear of sediment, as a boiler, or of air, as a steam pipe, by driving off or permitting escape. [1913 Webster] 5. To clear from guilt, or from moral or ceremonial defilement; as, to purge one of guilt or crime. [1913 Webster] When that he hath purged you from sin. --Chaucer. [1913 Webster] Purge me with hyssop, and I shall be clean. --Ps. li. 7. [1913 Webster] 6. (Law) To clear from accusation, or the charge of a crime or misdemeanor, as by oath or in ordeal. [1913 Webster] 7. To remove in cleansing; to deterge; to wash away; -- often followed by away. [1913 Webster] Purge away our sins, for thy name's sake. --Ps. lxxix. 9. [1913 Webster] We 'll join our cares to purge away Our country's crimes. --Addison. [1913 Webster]