secede
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/sɪˈsiːd/
🇬🇧
/sɪˈsiːd/
To formally withdraw from a group or union, especially a political one.
South Carolina decided to secede from the United States in 1860, which led to the Civil War.
サウスカロライナは1860年にアメリカ合衆国から離反し、これが南北戦争を引き起こした。