VERB
(从国家、大集团中正式)退出，脱离，分离
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...
新加坡脱离马来西亚联邦成为一个独立的主权国家。
On 20 August 1960 Senegal seceded.
塞内加尔于 1960年 8 月 20 日独立出去。