Fail-safe Definition
 fālsāf 
  fail-safe
  
    adjective
  
 Designating, of, or involving a procedure designed to prevent malfunctioning or unintentional operation, often specif. of nuclear-armed aircraft, through an intricate system of protective devices.
 Webster's New World 
Capable of compensating automatically and safely for a failure, as of a mechanism or power source.
 American Heritage 
Acting to discontinue a military attack on the occurrence of any of various predetermined conditions.
 American Heritage 
Guaranteed not to fail.
 American Heritage 
Alternative form of fail-safe.
Wiktionary 
Synonyms: 
  
    noun
  
 A fail-safe mechanism.
 American Heritage 
    verb
  
 To compensate automatically, in the event of a failure.
Wiktionary 
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