opt-outWiktionary 原文英美构词拆解opt词干+out词干词源说明From opt + out.释义形容词adjective1Requiring a person or organization to choose explicitly to avoid or forbid something; tending to include by default; used particularly with regard to mailing lists and advertising.名词noun1The act of opting out of something.2UK, countableA school or hospital that has withdrawn from local