Children's, Intermediate and Advanced Online English Dictionary & Thesaurus

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fail-safe protected against failure or breakdown, as by a compensatory or back-up mechanism that begins to function automatically in an emergency. [5 definitions]
play it safe to act so as to prevent or avoid misfortune or danger; be cautious.
safe house a dwelling used by a spy agency, underground organization, or the like as a refuge for its members, or by a police organization to protect witnesses whose impending testimony endangers their lives.
safe-conduct the privilege of passing unmolested through a particular region, such as a contested area in wartime, or the document or escort authorizing such passage. [2 definitions]
safe-deposit of or designating secure storage for valuable items, as in a bank vault or lockbox; safety deposit.