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From The Collaborative International Dictionary of English v.0.48:
Unchurch \Un*church"\, v. t. [1st pref. un- + church.] 1. To expel, or cause to separate, from a church; to excommunicate. --Sir M. Hale. [1913 Webster] 2. To deprive of the character, privileges, and authority of a church. --South. [1913 Webster]