Etymology
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expurgate (v.)

1620s, "to purge" (in anatomy), back-formation from expurgation or from Latin expurgatus, past participle of expurgare "to cleanse out, purge, purify." Related: Expurgated; expurgating. The earlier verb was simply expurge (late 15c.), from French expurger. Meaning "remove (something offensive or erroneous) from" is from 1670s.

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Definitions of expurgate

expurgate (v.)
edit by omitting or modifying parts considered indelicate;
Synonyms: bowdlerize / bowdlerise / castrate / shorten
From wordnet.princeton.edu