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8 Words That Are Older Than You Think

idiot-proof

[id-ee-uh t-proof] /ˈɪd i ətˌpruf/
adjective
1.
built, organized, written, etc., in such a way as to be usable by or understandable to any person of average intelligence or skill:
an idiot-proof camera.
Origin
1975-1980
probably earlier than 1975-80
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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