mod. foolproof; not subject to misuse. : This scheme is not goof-proof, but it's pretty sound.
tv. to make something foolproof; to take action to see that something cannot be misused. : See if this can be goof-proofed by Monday evening.
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition. Copyright 2007. Published by McGraw Hill.
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