back-Wiktionary 原文英美词源链中古英语Middle English约 1150–1500 年bak-↓ 继承英语Englishback-词源说明From Middle English bak-, bac-, apheretic form of abak, aback (“aback”, adverb). See also aback.释义前缀prefix1Back in its adverbial senses.2Situated, located, or toward the rear; backward or in reverse; in return; again.3UK, obsoleteFalse; pseudo-.