belt and braces
The phrase "belt and braces" is an idiomatic expression that means taking an overly cautious or unnecessarily redundant approach to ensure that something is done or protected in the most secure way possible. It originates from the practice of wearing both a belt and suspenders (braces) to hold up trousers, despite either one of them being sufficient. It implies a person's tendency to go to great lengths and take additional measures to ensure something is foolproof or protected.
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