student asking question

What does "foolproof" mean? Is it slang?

teacher

Native speaker’s answer

Rebecca

"Foolproof" is not slang! It's actually an adjective that means reliable and that there's no possibility of failure or errors. Ex: We have a foolproof solution for the budgeting issue. Ex: This liquid eyeliner is foolproof. Ex: There's no foolproof way to prevent aging.

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