to rid (something) of impurities
to rid (a nation, party, etc) of unwanted or undesirable members, often summarily or by force
to get rid of (undesirable people) by means of a purge
to clear (somebody) of guilt or of a charge
to free (somebody) from moral impurity
in law, to relieve oneself of (a legal offence, e.g. contempt of court, or the sentence for it) by some appropriate action
to cause evacuation of faeces from (the bowels)
to cause evacuation of faeces from the bowels of (somebody)
to be purged or purified
[Middle English purgen via Old Frenchfrom Latin purgare to purify, purge, from purus pure + agere to drive, do]