OFF-
Meaning of OFF- in English
/ ɒf; NAmE ɔːf; ɑːf/ prefix
(in nouns, adjectives, verbs and adverbs) not on; away from :
offstage
offload
Oxford Advanced Learner's English Dictionary.
Оксфордский английский словарь для изучающик язык на продвинутом уровне.
2005