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surefire

[shoo r-fahyuh r, shur-] /ˈʃʊərˌfaɪər, ˈʃɜr-/
adjective
1.
sure to work; foolproof:
a surefire moneymaking scheme.
Origin
1915-1920
1915-20; sure + fire
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Word Origin and History for sure fire

surefire

adj.

also sure-fire, by 1864, American English, from sure + fire (v.). Originally of rifles.

Online Etymology Dictionary, © 2010 Douglas Harper
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