adjective
[ usually before noun ] ( of machinery or equipment ) designed to stop working if anything goes wrong :
a fail-safe device / mechanism / system
adjective
[ usually before noun ] ( of machinery or equipment ) designed to stop working if anything goes wrong :
a fail-safe device / mechanism / system
Oxford Advanced Learner's English Dictionary. Оксфордский английский словарь для изучающик язык на продвинутом уровне. 2005