VERB
(從國家、大集團中正式)退出，脫離，分離
If a region or group secedes from the country or larger group to which it belongs, it formally becomes a separate country or stops being a member of the larger group.
例句
Singapore seceded from the Federation of Malaysia and became an independent sovereign state...
新加坡脫離馬來西亞聯邦成為一個獨立的主權國家。
On 20 August 1960 Senegal seceded.
塞內加爾于 1960年 8 月 20 日獨立出去。