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surefire

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surefire/ˈʃɚˈfajɚ/
British/ˈʃɔːˈfajə/adjective
surefire
/ˈʃɚˈfajɚ/British/ˈʃɔːˈfajə/
adjective
Learner's definition of SUREFIRE  
always used before a nouninformal
: certain not to fail : sure to be successful
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