abandon, abire, apostatize, break away, decedere, depart, desert, disaffiliate, dissent, evacuate, insurrect, leave, mutiny, pull out, quit, rebel, refuse to support, relinquish, remove oneself, repudiate, resign, retire, retract, revolt, separate, sever one's connections, tergiversate, vacate, walk out, withdraw
defect, leave (depart), quit (discontinue), renege, withdraw
Burton's Legal Thesaurus. William C. Burton. 2006
v.To withdraw formally from a union, an alliance, or a political or religious group.n.secession
The Essential Law Dictionary. — Sphinx Publishing, An imprint of Sourcebooks, Inc. Amy Hackney Blackwell. 2008.