Where on earth did Philosophers get the idea that "just in case" means "if and

Where on earth did Philosophers get the idea that "just in case" means "if and

Where on earth did Philosophers get the idea that "just in case" means "if and only if"[1] instead of "in the event of"? I ask just in case there's a legitimate reason for the apparently willful muddying of language! [1] for example http://www.askphilosophers.org/question/2290

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